Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 03-26-2014, 10:20 PM   #1
Junior Member
cobria7's Avatar
Join Date: Mar 2014
Location: Brook Park Mn
Posts: 1
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?

cobria7 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 03-26-2014, 11:04 PM   #2
Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Kitts Hill, OH
Posts: 1,972
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?

(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
Mekanic is offline   Reply With Quote
Old 03-26-2014, 11:23 PM   #3
Senior Member
stink's Avatar
Join Date: Apr 2012
Posts: 1,414
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.
Dave and Laura & two cats
02 Discovery with Accord toad
retired auto rv tech and teacher, wife rt nurse
stink is offline   Reply With Quote
Old 03-26-2014, 11:25 PM   #4
Senior Member
chboone's Avatar

National RV Owners Club
Ford Super Duty Owner
Join Date: Sep 2010
Location: Horse Town USA, CA.
Posts: 3,062
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.

1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat 6.0 Diesel Crew Cab DRW, 4X4, B&W Custom Truck Bed, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000, 1994 36ft Avion 5er, GVWR 13,700
chboone is offline   Reply With Quote
Old 03-27-2014, 08:39 AM   #5
Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Kitts Hill, OH
Posts: 1,972
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.
(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
Mekanic is offline   Reply With Quote

brake, brakes

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Coachmen: Coachmen Cross Country 354 MBS Newbie58 Forest River Owners Forum 24 04-26-2016 08:46 AM
Cross Country Trip, Fall 2014 Just us 2 Tiffin Motorhomes Owners Forum 10 08-23-2014 09:43 AM
2004 Cross Country AC Question jaxsooner Class A Motorhome Discussions 2 03-26-2014 06:49 PM
Coachmen: 2012 Coachmen Sportscoach Cross Country (405FK) Dashboard Lights Help Needed :) Mike-n-Karen Forest River Owners Forum 4 03-16-2014 07:07 PM
Problems with buying MH not driven for years GigaWatt Class A Motorhome Discussions 15 08-16-2013 01:10 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:14 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.