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Old 03-26-2014, 10:20 PM   #1
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1984 Sportcoach Cross Country Brakes

I put a new master cylinder and calipers on the front.
then after driving a mile or so they started to lock up,opened the bleeder than could go for a mile or so before they started to lock up gain.
what is going on?

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Old 03-26-2014, 11:04 PM   #2
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2 possibilitys
1 you have a line that some where close to a heat source heat expans the brake fluid and creates pressure.
2 more likely is I'd guess the insides of you rubber brake hoses are Mush inside and acting like check valves. its a 30 year old vehicle, How old do you think the hoses are?
Has it been parked for a long time lately?

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Old 03-26-2014, 11:23 PM   #3
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Booster pushrod out of adjustment. Sounds like the master cylinder is not able to reliese all the way. Makanic suggests the rubber hoses and this is a possibility. If only one caliper is dragging I would say rubber hoses but you stated both calipers were dragging. To check the hoses drive for that mile to cause the calipers to drag then bleed just one. If both calipers loosten then I don't think a problem with the hoses are the culprit. Your mh is almost thirty years old I would suggest changing hoses anyways.
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Old 03-26-2014, 11:25 PM   #4
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One other possibility is the rod from the brake pedal to the master cylinder needs to be adjusted. If the rod is depressing the master slightly it can cause the brakes to lock up.

Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129
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Old 03-27-2014, 08:39 AM   #5
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I also agree with post #3 and #4. Years ago replacement parts were 99.9% of the time Exactly like what you took off. That is something that needs check in modern times.
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brake, brakes

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