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07-05-2017, 08:43 PM
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#1
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Member
Join Date: Aug 2012
Location: u.s.
Posts: 45
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Help we're broke down
1999 George Town 303 7.4L 454 need part number for master cylinder. Auto zone and advance auto keeps giving me the wrong part. Help!! C30 Chassie
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07-05-2017, 08:50 PM
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#2
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Moderator Emeritus
Join Date: Oct 2014
Posts: 1,024
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Quote:
Originally Posted by coyote2001
1999 George Town 303 7.4L 454 need part number for master cylinder. Auto zone and advance auto keeps giving me the wrong part. Help!! C30 Chassie
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Aw, sorry to hear that! While I can't fix a master cylinder, I can buy a 6-pack and play cards while we wait!! :-)
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Rick & Karen
(Retired USAF, MSgt)
Monument, Colorado
8-year Travel Trailer RVers
2013 Forest River Rockwood Ultra-Lite 2904SS
2014 Toyota Tundra Maxcrew SR-5 TRD 4x4 (with Firestone airbags in the rear)
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07-05-2017, 08:53 PM
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#3
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Senior Member
Join Date: Jun 2013
Posts: 10,833
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What about a GM dealer or NAPA they keep Stock Cars running!
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07-05-2017, 09:07 PM
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#4
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Senior Member
Join Date: Jul 2012
Location: SE Arizona's Gila Vally
Posts: 1,510
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There should only be two choices for that unit. Vacuum boost or hydraulic boost unless you have Disc brakes front AND rear then it could get hard to match.
Here is the O'Reily parts page with both Master Cylinders.
http://www.oreillyauto.com/site/c/se...=1999&make=GMC
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2016 RAM 1500 - 2016 Keystone Laredo 265SRK
The road goes on forever and the party never ends.
Illegitimum non carborundum
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07-05-2017, 10:13 PM
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#5
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Member
Join Date: Aug 2012
Location: u.s.
Posts: 45
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We just came out of a dead stop for about 30 mins from a accident e-way was shut down we pull into gas station to refuel then as soon as I started to roll the breaks went to the floor
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07-05-2017, 11:36 PM
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#6
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Senior Member
Join Date: Jun 2011
Location: Big brown desert
Posts: 3,003
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For something as critical as brakes, contact a chevy dealer and tell them it is a motor home. They can try to locate for you at local dealers.
I can try to get GM part number in the morning
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2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away 
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07-06-2017, 08:48 AM
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#7
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Member
Join Date: Aug 2012
Location: u.s.
Posts: 45
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Ok many thanks for all the help. We read some forms and found out the heat from the engine from being idle in traffic made it boil over we came back today put the old one back on and it works great !! I'm Going to put a heat shield on it when we get home.
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07-06-2017, 09:02 AM
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#8
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Senior Member
Join Date: Aug 2013
Posts: 7,916
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Hmmm 25+ years in parts and never heard of that. Be careful and allow plenty of room for stops for a while. Make sure you look at the wheels(inside of tire/rim) for fluid. Brake fluid feels warm on your skin if you feel of it. Could be a proportioning issue. I would replace master when you can...if it "went to the floor and it's old...it is trash". It will bypass in time from contaminants in the cylinder and by-passing. Be safe. I would also upgrade to DOT4 fluid...DOT5 is silicone and not an easy change.
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2017 Puma 297RLSS
2005 Ram 2500 4X4 diesel SMOKER!!
I love puns, irony and tasteless jokes...
born in Texas.... live in Arkansas 
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07-06-2017, 09:10 AM
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#9
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Member
Join Date: Aug 2012
Location: u.s.
Posts: 45
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Quote:
Originally Posted by Iwannacamp
Hmmm 25+ years in parts and never heard of that. Be careful and allow plenty of room for stops for a while. Make sure you look at the wheels(inside of tire/rim) for fluid. Brake fluid feels warm on your skin if you feel of it. Could be a proportioning issue. I would replace master when you can...if it "went to the floor and it's old...it is trash". It will bypass in time from contaminants in the cylinder and by-passing. Be safe. I would also upgrade to DOT4 fluid...DOT5 is silicone and not an easy change.
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We cleaned the bowls out they had a thin layer of some black sludge in the bottom and put dot 4 back in. Breaks seem to work better than before.
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07-06-2017, 09:27 AM
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#10
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Senior Member
Join Date: Feb 2017
Location: SW Ohio
Posts: 1,694
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Brake fluid attracts water and can boil, when that happens the pedal will go to the floor.
It happened to me with a 1994 bounder on F53 chassis, high air temperature stop and go hilly curvy roads do to expressway being closed. I suspect mine was from the brakes being too hot but there is no real way to be sure where it was and air bubbles any where and the pedal will go to the floor.
The F53 recommends annual brake fluid change, it was probably over 10 years old and was never done, I did it every other year after that.
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2024 Artic Fox 3018 5th Wheel
Grand Design 2800BH TT 2021 - for sale
Prior TT 2017 Flagstaff 831CLBSS Classic Ultra lite - SOLD 5/21
TV 2024 F350 DRW - on order
Prior TV 2017 F150 6.5' bed 3.5 Eco-boost Max tow 1800lbs payload
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07-06-2017, 09:48 AM
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#11
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Senior Member
Join Date: Mar 2015
Posts: 126
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Change brake fluid to a DOT 4 synthetic. That will help with heat
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07-06-2017, 10:27 AM
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#12
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Member
Join Date: Aug 2012
Location: u.s.
Posts: 45
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Yes
Yes it seem it boiled out of the cap
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07-06-2017, 12:26 PM
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#13
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Senior Member
Join Date: Mar 2012
Location: Tidewater Virginia
Posts: 159
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Need help broke down
The mechanic got mine from NAPA. No problem
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07-06-2017, 12:57 PM
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#14
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Member
Join Date: Aug 2012
Location: u.s.
Posts: 45
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Quote:
Originally Posted by twiggw
The mechanic got mine from NAPA. No problem
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[emoji106]advance auto told me they have to order it from the factory. I'm replacing it when we get home.
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07-06-2017, 01:11 PM
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#15
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Senior Member
Join Date: Aug 2013
Posts: 7,916
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Ohhh one other thing... flush with new fluid when replacing. I.E. change the brake fluid
__________________
2017 Puma 297RLSS
2005 Ram 2500 4X4 diesel SMOKER!!
I love puns, irony and tasteless jokes...
born in Texas.... live in Arkansas
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07-06-2017, 01:23 PM
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#16
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Senior Member
Join Date: Nov 2015
Posts: 672
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Brake fluid really needs to be COMPLETELY FLUSHED once a year if you want all the brake components to last. Super heating while going down hill and then cooling while going flat or uphill will vacuum in outside air. Warm outside air has lots of moisture in it. The moisture is absorbed by the brake fluid and dispersed throughout the system. Moisture causes rust and then components fail. Usually one caliper will go bad and the other three will need to take up the slack. Extra heat on the three builds up and BAM, NO BRAKES.
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07-06-2017, 02:25 PM
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#17
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Junior Member
Join Date: Aug 2015
Posts: 23
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Had brakes fail on 1997 P30 chassis disc brakes going down mountain in Wyoming had to stop at bottom for road work when we pulled away fortunately on level ground and I touched brake it went to floor. Got them cooled down and when we got home started researching brake fluid, there is all different wet boiling points for brake fluid. The Highest wet point boiling point fluid that I could find is Castrol Racing Brake Fluid, (wet boiling point of 519 deg F) it is pricy at $65 to $75 per quart and you will ned to completely purge lines and cylinders for it to work properly.
But as one fellow said you would not want that to be your last thought as you went off the mountain-- if only I had paid a little more for the good stuff--
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07-06-2017, 02:46 PM
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#18
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Senior Member
Join Date: Feb 2017
Location: SW Ohio
Posts: 1,694
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regular brake fluid attracts water (Hydroscopic), not sure if the special stuff like castrol does. for the most part in non-racing application unless the fluid is very fresh the boiling point doesn't matter as it is well over the 212 degrees for water to boil and the steam is air space in the line and no brakes.
from wikipedia : Glycol-ether (DOT 3, 4, and 5.1) brake fluids are hygroscopic (water absorbing), which means they absorb moisture from the atmosphere under normal humidity levels. ... Wet boiling point defined as 3.7% water by volume.
__________________
2024 Artic Fox 3018 5th Wheel
Grand Design 2800BH TT 2021 - for sale
Prior TT 2017 Flagstaff 831CLBSS Classic Ultra lite - SOLD 5/21
TV 2024 F350 DRW - on order
Prior TV 2017 F150 6.5' bed 3.5 Eco-boost Max tow 1800lbs payload
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07-06-2017, 02:53 PM
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#19
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Member
Join Date: Aug 2012
Location: u.s.
Posts: 45
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Quote:
Originally Posted by MtBiker
Brake fluid really needs to be COMPLETELY FLUSHED once a year if you want all the brake components to last. Super heating while going down hill and then cooling while going flat or uphill will vacuum in outside air. Warm outside air has lots of moisture in it. The moisture is absorbed by the brake fluid and dispersed throughout the system. Moisture causes rust and then components fail. Usually one caliper will go bad and the other three will need to take up the slack. Extra heat on the three builds up and BAM, NO BRAKES.
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[emoji106]
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07-06-2017, 05:33 PM
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#20
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Senior Member
Join Date: Jul 2017
Posts: 121
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i had a 2001 winnebago with workhorse 8.1L and had to read number off of part on motorhome. part stores can probably find it then. sometimes mine was listed as gmc c3500hd with "wrecker package". "wrecker package" is key to match brake parts for motorhome. Oreilly's will deliver for free. "ultra rv products" is very good also
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