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Old 08-10-2016, 11:29 AM   #1
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2004 30' Land Yacht 30 SL
Elkmont , Alabama
Join Date: Dec 2015
Posts: 7
Question Still having Brake problems with P32 chassis

The auto park brake system you helped me with seems to be OK at this time.

While we were having issues with the parking / auto brake, I took the opportunity to have the main brakes checked as there seemed
to have excessive pedal travel.
The litany of events follows!
1) Discs were skimmed.
After lines were bled I drove the unit and found the front brakes were getting hot.
2) Calipers replaced with new.
Brakes still were getting hot.

3) Master cylinder replaced with new and Hydra Boost expert rebuilt with a year warranty.
Calipers still not freeing properly.

4) At great expense replaced all the brake lines!.
Calipers still not freeing!

Today ordered new spacer to replace existing, between Hydra boost and master cylinder.

Can you suggest how to proceed, is there a special adjustment needed when new spacer is installed?
Workhorse say the spacer is critical to calipers opening after brakes applied?

We wish to take this unit up to Canada to visit friends, but need to have sound brakes that do not overheat!

I have been blessed to have many vehicles during my 77 years, but not since my (1950 ish) Fiat Topolino 500cc have I
had one with more challenges than the P32 chassis on this otherwise excellent Airstream motor home!!
Every Blessing
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Old 08-13-2016, 12:25 PM   #2
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2000 31' Land Yacht
Central , Florida
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Everybody here talks about the p30 Chevy chassis but yours should be a Workhorse chassis as chevy in their wisdom sold out to them. Along with the problems, but I haven't run across where there was a recall when there should have been a recall, on the auto brake and the caliper system brakes.
Chevy took the simple hand brake and replaced with electro-mechanical high tech(POS), instead of modifying the transmission by adding a sturdier prawn to hold in park. The caliper brakes on mine suffered from overheat in rear due to crud in the fluid, water boils off and steam doesn't compress the same as brake fluid, but my feeling is that the slide mechanism on the calipers gets rusty and freezes up. When your mechanic replaced the calipers and turned the rotors, did he do a through job of cleaning up and testing their release as well as their application? I found an IR thermometer can aim and check exactly where the hottest spot is around the wheel and axle.
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Old 03-27-2018, 05:19 PM   #3
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2004 30' Land Yacht Gas 30
Clearwater , Florida
Join Date: Nov 2011
Posts: 29
Quote:
Originally Posted by DaveFL View Post
Everybody here talks about the p30 Chevy chassis but yours should be a Workhorse chassis as chevy in their wisdom sold out to them. Along with the problems, but I haven't run across where there was a recall when there should have been a recall, on the auto brake and the caliper system brakes.
Chevy took the simple hand brake and replaced with electro-mechanical high tech(POS), instead of modifying the transmission by adding a sturdier prawn to hold in park. The caliper brakes on mine suffered from overheat in rear due to crud in the fluid, water boils off and steam doesn't compress the same as brake fluid, but my feeling is that the slide mechanism on the calipers gets rusty and freezes up. When your mechanic replaced the calipers and turned the rotors, did he do a through job of cleaning up and testing their release as well as their application? I found an IR thermometer can aim and check exactly where the hottest spot is around the wheel and axle.
Sorry but off topic from the original post.....But...Hahah POS park brake is right! Decided to get my RV out of storage to go camping. The park brake would NOT release!~! I almost called all our friends to cancel. Thank goodness I had my voltmeter and tools with me and decided to check a few things. 4 hours later I found a damaged $12 bleeding relay. Replaced both sensors for good measure too. Ordered replacements. Replaced 3 faulty leaking sensors in 5 years. I cant understand the logic of this system going through the schematics it seems like an accident waiting to happen and so many things can go wrong which will leave one stranded.. Craziness. Anyway I remembered a few months back the Rotten green switch failed while I was on the highway. I could not immediately stop so drove a while with the hydraulic pump running. What must have happened was the run relay got too hot and caused damage to the contacts. Now I keep a spare relay too.
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Old 03-27-2018, 05:32 PM   #4
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2004 30' Land Yacht Gas 30
Clearwater , Florida
Join Date: Nov 2011
Posts: 29
Quote:
Originally Posted by Grandave View Post
The auto park brake system you helped me with seems to be OK at this time.

While we were having issues with the parking / auto brake, I took the opportunity to have the main brakes checked as there seemed
to have excessive pedal travel.
The litany of events follows!
1) Discs were skimmed.
After lines were bled I drove the unit and found the front brakes were getting hot.
2) Calipers replaced with new.
Brakes still were getting hot.

3) Master cylinder replaced with new and Hydra Boost expert rebuilt with a year warranty.
Calipers still not freeing properly.

4) At great expense replaced all the brake lines!.
Calipers still not freeing!

Today ordered new spacer to replace existing, between Hydra boost and master cylinder.

Can you suggest how to proceed, is there a special adjustment needed when new spacer is installed?
Workhorse say the spacer is critical to calipers opening after brakes applied?

We wish to take this unit up to Canada to visit friends, but need to have sound brakes that do not overheat!

I have been blessed to have many vehicles during my 77 years, but not since my (1950 ish) Fiat Topolino 500cc have I
had one with more challenges than the P32 chassis on this otherwise excellent Airstream motor home!!
Every Blessing
Can you let me know if you fixed your problem GranDave. My 2004 30 S.O Landyacht is having a similar issue. Just the front passenger wheel caliper will not release completely and will heat up. I haven't inspected it myself and I plan too. Just qualified Brake people have done troubleshooting. When we were in NC mountains it was a huge issue. I'm considering installing a retrofit temp system just so I can monitor the heat while in motion.
Thanks.
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Old 03-27-2018, 05:34 PM   #5
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1997 30' Excella
Austin , Texas
Join Date: Feb 2002
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Quote:
Originally Posted by Grandave View Post
The auto park brake system you helped me with seems to be OK at this time.

While we were having issues with the parking / auto brake, I took the opportunity to have the main brakes checked as there seemed
to have excessive pedal travel.
The litany of events follows!
1) Discs were skimmed.
After lines were bled I drove the unit and found the front brakes were getting hot.
2) Calipers replaced with new.
Brakes still were getting hot.

3) Master cylinder replaced with new and Hydra Boost expert rebuilt with a year warranty.
Calipers still not freeing properly.

4) At great expense replaced all the brake lines!.
Calipers still not freeing!

Today ordered new spacer to replace existing, between Hydra boost and master cylinder.

Can you suggest how to proceed, is there a special adjustment needed when new spacer is installed?
Workhorse say the spacer is critical to calipers opening after brakes applied?

We wish to take this unit up to Canada to visit friends, but need to have sound brakes that do not overheat!

I have been blessed to have many vehicles during my 77 years, but not since my (1950 ish) Fiat Topolino 500cc have I
had one with more challenges than the P32 chassis on this otherwise excellent Airstream motor home!!
Every Blessing
I feel your pain, because my first car was a 1962 white Fiat 500
Interesting suggestion to install spacers, since I did that on a 1987 P30 Classic Airstream. My brakes completely locked up, fortunately in my driveway. Since I already had a fair warning that this vehicle may have that problem (pre-loading of the brake system) I had a buddy sit close to one of the wheels and slowly unbolted the Master cylinder, a quarter turn at a time. When we heard the calipers releasing, I measured the space with a feeler gauge and used spacer of that size, I thought at the time, it was a rather unprofessional way to fix my problem, that is why I am surprised to hear it from the pros. Just please don't take my word for it.
Good luck!
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