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|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.