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Old 10-20-2004, 12:46 PM   #15
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Woodstock , Georgia
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Spoke to Dennis last night and they are enjoying themselves in spite of a harrowing trip from Texas to Georgia. He is going to make the adjustments and check it out.
On the way to see Ruby Falls when we spoke.
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Old 10-20-2004, 02:40 PM   #16
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PM received

Steven, I tried to PM you several days ago when you contacted me about Dennis' brake problem. I got a message you had too many PMs, and could not receive it.
My advice was the same as some others, MC pushrod, and MC.
Let me know what the outcome is.
BTW, I just tried to PM you again, with the same result.
Terry
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Old 10-20-2004, 03:21 PM   #17
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Boy do those PM's add up! Thanks for the info Terry - cleared my PM's
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Old 10-20-2004, 04:31 PM   #18
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I've just checked the service manual for my '74 P30 chassis. If the '87 uses the Hydro-Boost brake booster as mine does, it appears that MC pushrod adjustment isn't the problem. The pushrod (on the P30) gets set to 9.9" eye-to-eye length, but that's it. There is no brake pedal stop; the MC rest position is set only by the MC itself and the booster it's attached to.

It's possible that something under the dash may be interfering with the pedal, but I doubt it. More likely to me is a problem with the MC itself or its attachment to the booster. I realized that the GMCs I mentioned in a recent posting use a conventional vacuum booster; the hardware and installation are completely different from the Hydro-Boost systems.

Bob
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Old 10-25-2004, 06:26 AM   #19
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Another update. Dennis ended up putting on a different (US Made) MC and he thinks this solved his problem. He told me when he put the recently replaced MC next to the new one the sizes were different.

I'm sure he'll post more about this when he gets back home in a few days. Again, he passes along his thanks for all of the advice.

PS - if anyone ever gets the chance to check out his rig I highly recommend it. I wasn't sure which was more impressive; the perfectly clean (almost new) undercarriage or the bose suround sound system with the big flat panel LCD TV. Certainly shows what can be done with these old rigs!
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Old 10-27-2004, 04:43 PM   #20
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Many thanks for all replies, calls, and PM's!!

Thanks to everyone for your replies!!!

The problem turned out to be the "new" Master Cylinder ($50 foreign made from O'Reilly's) that was pre-loading on it's own.

When I took off the "new" (O'Reilly's) MC I could detect no adjustment points for the Hydroboost to MC push-rod, so I proceeded with the Master Cylinder replacement. The first one, picked up from NAPA in Trenton, GA (10 miles from Cloudland Canyon) was the wrong size. Jim Mickle (JCMickle here on the forum - retired GM) graciously picked it up for me on his supply trip to town ($50, rebuilt). I brought the unused "rebuild" back, and the only one in stock to fit the unit was a $150 "new" (not GM) unit.

You gotta' do what you gotta' do.

A couple of quarts of Synth Blend DOT 3/4 brake fluid later - and I'm ready for the road.

Thanks to all to all who helped at the Ralley.

BTW, I recently purchased a full set of Chevy/GM manuals off of e-bay

ST-330-86 10-30 Series Shop Manual
ST-330-86 WD 10-30 Series Shop Manual Wiring Diagram
ST-333-86 10-30 Series Unit Repair Manual

Picked all 3 up on one sale - PM me if anyone needs a page cut.

The manuals confirmed that no adjustment is possible on the push rod.
It is also painfully obvious that I do not want to do an overhaul to the Hydro-Boost unit - Way too many seals and tight fits - as with the master cylinder - a new or rebuilt unit will be purchased when it's time has come.


One more system (hopefully) fixed for a while.
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Old 12-24-2004, 10:00 PM   #21
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Guess what? My hydro-boost gave up...it was bone dry from several leaks apparently from 4 different high pressure fittings. The dealer has to have them manufactured cuz they can't find replacements for the fittings. The hydro-boost shares it's job with the power steering too. Both brakes and steering went south, so I had to scrap my Christmas trip to Seattle. Here I sit broken hearted reading emails.
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Old 12-25-2004, 05:55 AM   #22
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Quote:
Originally Posted by Astrodokk
Guess what? My hydro-boost gave up...it was bone dry from several leaks apparently from 4 different high pressure fittings. The dealer has to have them manufactured cuz they can't find replacements for the fittings. The hydro-boost shares it's job with the power steering too. Both brakes and steering went south, so I had to scrap my Christmas trip to Seattle. Here I sit broken hearted reading emails.
Was it the Hydroboost unit itself, or the fittings on the hoses that go to it? If it is the hoses, it will be a fairly straightforward repair, although nothing you could get done on Christmas day. At least you are safe at home with this problem, and it can be fixed.
Merry Christmas.
Terry
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Old 12-25-2004, 07:00 AM   #23
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Unfortunate news! But then at least it did not happen many miles from home.
Hope you will have a merry christmas.
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Old 12-26-2004, 04:59 PM   #24
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hydro-booster

When my hydro-booster went out i replaced it with a new one from Workhorse Chasis. Good Luck ...
http://www.workhorse.com/
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Old 12-26-2004, 05:46 PM   #25
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Was it the hydroboost or the pump that went out? I would think the pump would burn up running dry before the hydroboost.

John
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Old 02-13-2009, 04:40 PM   #26
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Quote:
Originally Posted by mcneon View Post
I've just checked the service manual for my '74 P30 chassis. If the '87 uses the Hydro-Boost brake booster as mine does, it appears that MC pushrod adjustment isn't the problem. The pushrod (on the P30) gets set to 9.9" eye-to-eye length, but that's it. There is no brake pedal stop; the MC rest position is set only by the MC itself and the booster it's attached to.

It's possible that something under the dash may be interfering with the pedal, but I doubt it. More likely to me is a problem with the MC itself or its attachment to the booster. I realized that the GMCs I mentioned in a recent posting use a conventional vacuum booster; the hardware and installation are completely different from the Hydro-Boost systems.
Many thanks to Bob (and everyone else) for helping me out all those years ago....it's hard to believe just how long ago it was.

I was remiss in following up with the REST of the story...I did have the "brake lock up" problem one more time - thanks to the info here on the forums (thanks again, Bob) I found that the pedal to hydroboost linkage was a bit too long - the set up was not allowing the brakes to release all of the way all of the time...

Backed off a couple of turns on the adjustment linkage and all was well...I shudder to think what a service call at a GM dealer would have run me on that one.
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Old 04-10-2009, 02:21 PM   #27
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Guys I had this problem when I first purchased my 82 280.. the master cylinder needs to be shimmed otherwise it will apply the brakes every time...

Trust me on this it cost me a new tranny as well

Justin
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Old 04-21-2009, 06:11 PM   #28
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Alpharetta , Georgia
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I just replaced my master cylinder to address a leak, and I was hoping my brake pedal would have improved. However, it remains the same. We flushed the fluid out when we replaced teh MC.

My pedal travels a long way before the brakes start to apply, then it still seems soft.

I will flush out the power steering fluid and check the pedal to hydroboost linkage to see if that helps.

What do your brake pedals feel like? Mine are not very confidence inspiring, but I want to make sure my expectations are set correctly.

What are the symptoms of a failing HydroBoost?

Paul
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