Motorhome & Recreational Vehicle Resource

Since 1996

Search RV-Coach Online

Email Author email Chuck  Reply to Message reply to message  Post New Message post new message      search forums
All Postings that advertise items for sale will be deleted from the Discussion Forum. You may post sale items for free in the Classifieds section. Sign up now.
All Messages in ThreadAuthorDate
1983 HR MH with P30 Chassis Brakes Self Apply Chuck 1-1-16  
This unit is a 1983 Holiday Rambler with the CHEVY P30 chassis. It has the HYDROBOOST brake system on it.
Nothing was wrong with the system when i started, i just wanted it all to be new. (lesson here... if not broke... don't fix) lol. So I replaced the entire braking system, hydrobooster, master cylinder, portioning block etc., pads, calipers, lines power steering pump.
At first the system seemed to work for the first 5 miles but then i noticed the engine was dragging down. Note here that engine was warmed up to normal engine temp.
Then i realised it was the brakes applying themselves and the peddle was hard as a rock and all the way up so when i put my foot on the peddle is was no play in it. All six wheels heated up and started smoking so i know something is bad wrong. I had to remove the retuirn line on the booster and let the PS fluid out before i could move the thing. So with the fluid low as it was the PS pump could not build up pressure to lock the brakes, but i was able to drive it back home. (PS was really growling on turns and braking)
This brake system is all mechanical and no auto park stuff. All hoses of any type were replaced and i just finished checking them again for kinks etc. Return lines are clear and new and no kinks.
All SIX wheels were engaged and hot as fire when i stopped. The tag axel operates off an independent hydraulic over vacuum booster system that just applies to the tag axel itself. That vacuum booster is activated when the brake pedel is pushed causing brake fluid from the main master cylinder to engage the tag axel master cylinder and that will engage the tag axel brakes.
Anyway, maybe someone out there has had the same issue and can help me locate the trouble maker. lol
Thanks for any help.
Re: 1983 HR MH with P30 Chassis Brakes Self Apply Bubba The Bus Tech 1-4-16  
Best guess is the push rod from the brake peddle to the hydroboost is to long.

2nd best guess is a faulty hydroboost.
Required fields in red
For more info about a field, place your mouse over the More Info icon.
Your Name:
Your Email:

Code is case-sensitive. Helps stop SPAM.

Advertise Here
Get Media Kit NOW!

Get Media Kit to Advertise!

Advertiser Links

Back to Top