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Old 10-24-2015, 07:26 AM   #365
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Finding the right mechanic can be like trying to find a needle in a haystack. Here's hoping you've found one
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Old 10-24-2015, 08:09 AM   #366
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Originally Posted by martin300662 View Post
i'm not best pleased but holding off from confronting the first shop until I actually find out what is wrong (this time).

The good news is I seem to have finally found a shop and a mechanic who is a little old school and seems to know what he is talking about....fingers crossed.
Having done brakes on these big beast several times, I am very curious to hear what went wrong. The rear drums require for the axle shafts to be pulled, which is a job most car repair shops try to stay away from. Once you do that you are ALWAYS better off to replace the wheel cylinders, oil seal and check or replace the bearings, besides the shoes and drum inspection.
Anything less would not be acceptable.
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Old 10-24-2015, 09:16 AM   #367
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Excuse this if it is only demonstrating my usual ignorance, but I believe you might have a hydroboost system on your MH. If so, then your sudden loss of fluid despite all the brake work might indicate that your fluid is being sucked into the accumulator. An occasional problem with this system.
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Old 10-24-2015, 09:37 AM   #368
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Excuse this if it is only demonstrating my usual ignorance, but I believe you might have a hydroboost system on your MH. If so, then your sudden loss of fluid despite all the brake work might indicate that your fluid is being sucked into the accumulator. An occasional problem with this system.
They are 2 independent systems, one uses Brake fluid the other powersteering fluid.
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Old 10-24-2015, 09:46 AM   #369
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The issue is definitely the brake fluid system, the hydroboost/power steering/accumulator is working fine.

The first shop must have disturbed something, I suspect in the combination valve, as it is the only place that both the front and rear circuit are in the same place (but even then separated), and MC was empty on both sides.
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Old 10-24-2015, 10:00 AM   #370
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The issue is definitely the brake fluid system, the hydroboost/power steering/accumulator is working fine.

The first shop must have disturbed something, I suspect in the combination valve, as it is the only place that both the front and rear circuit are in the same place (but even then separated), and MC was empty on both sides.

very odd, maybe they forgot to fill it
did you see a puddle anywhere? Thats a lot of fluid
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Old 10-24-2015, 10:27 AM   #371
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Well, at the risk of being guilty of recidivistic ignorance, I know that you can get PS fluid in your brake MC with the Hydroboost system, so I think that they must interface.........

How is your PS fluid level? Lost fluid must go somewhere, and if it isn't on the ground, where is it? In the cab? In the accumulator? I'm just trying to think of empty spaces that could take mysteriously disappearing fluid. Your brake professionals have looked at the normal and likely things, so time to think of the unlikely but possible.
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Old 10-24-2015, 10:39 AM   #372
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I reserve the right to state my opinions once all the facts are in. To speculate on where the brake fluid went on a moho this old would be redundant, although my jaundiced eye is on those pesky Airstream Gods.

You might want to get her fixed right before shipping her back home, as there are a lot more things to hit in the Old Country. I can see the headline now; "OAP claims no brakes in an American icon terrorist attack on the front gates of Buckingham Palace."

I can only hope that Martin had a spare set of skivvies after the pedal went down to the floor.

On the bright side, as Mike put it, you now know what your brake pedal feel should be, and you felt fine with it......before it crapped out on you; so that's a good thing.

Lots of luck with the old school mechanic. It's the buggers who walk out to our rigs with a laptop and an OBD connection you shake your head at.

Cheers
Tony
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Old 10-24-2015, 10:40 AM   #373
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The hydroboost is not the issue here, and the hydroboost circuit never comes anywhere near the brake circuit.

Best way to think of hydroboost is as an amplifier, increasing the mechanical advantage of the brake pedal on the MC, and it is effort not leverage that is assisted.

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Old 10-24-2015, 11:06 AM   #374
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But I'm going to annoy you, because my Chevy chassis manual has this little note:

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And I really don't see why they put it in if the systems don't get anywhere near each other.

(Plus all you have to do is a little Googling to find plenty of reports of Hydroboosts leaking into the master cylinder.) Don't shoot the messenger.
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Old 10-24-2015, 11:13 AM   #375
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But I'm going to annoy you, because my Chevy chassis manual has this little note:

Attachment 250946

And I really don't see why they put it in if the systems don't get anywhere near each other.
Because the hydroboost is an amplifier....you push the brake pedal with a certain effort, the hydroboost amplifies that effort on the MC. It is akin to changing the pivot point on the brake pedal to give a longer lever, without changing the length of the lever.

Just because the fluidic paths never come near each other, doesn't mean the hydroboost doesn't help with braking, it does.
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Old 10-24-2015, 11:15 AM   #376
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You're both right....

Yes, the hydroboost sytem is tied to the brake system and supplies boosting power for the brakes. Bad hydroboost system would lead to poor braking, or no brakes.

Yes both systems are independent of each other fluid wise. The foot note in your manual Punch is to stop anyone adding power steering fluid to the master cylinder to top up fluid as people could be confused by someone stating that the Hydroboost sytem control the brakes.

Martin has power steering so the hydroboost system is probably working.

Is that all fixed?
Cheers
Tony
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Old 10-24-2015, 11:38 AM   #377
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You're both right....

Yes, the hydroboost sytem is tied to the brake system and supplies boosting power for the brakes. Bad hydroboost system would lead to poor braking, or no brakes.

Yes both systems are independent of each other fluid wise. The foot note in your manual Punch is to stop anyone adding power steering fluid to the master cylinder to top up fluid as people could be confused by someone stating that the Hydroboost sytem control the brakes.

Martin has power steering so the hydroboost system is probably working.

Is that all fixed?
Cheers
Tony

OK, now I'll shut up.
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Old 10-24-2015, 11:40 AM   #378
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Yes, Tony.

I did say a few posts back, the hydroboost/power steering is working fine and levels are all good. There is a separate test procedure for testing both the high and low pressure circuit on the hydroboost and the system passes.
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