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 brake woes just killed my summer

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Bluebird57
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PostSubject: brake woes just killed my summer   Tue Sep 16, 2014 5:01 am

Hi everybody:

Well, I missed a whole summer of cruising in my 57. Brake problems! Weird unexplainable brake problems! I wonder if anyone night have any more advice.

Here's a rundown of things. I converted to a dual master cyl and booster which goes to stock drums in the rear and disc brakes up front (gm caliper, single piston.) all major components have been replaced at least once in an effort to get the system to work properly.

When I brought her out of storage, the PS caliper was grabby, but it let up after a block or two. I had some pedal firmness issues so I brought her in to my trusted local shop. (I'm a novice, I'm not going to take my life in my own hands with my brakes.) They tweaked a few things, it seemed fine, then I sailed through an intersection with the pedal to the floor. And that's been the major issue. How do you have a firm pedal one second than nothing the other and then get pressure back? Well they tweaked a few more things, and when I next had it out the front brakes locked up but good and the car had to be towed back in. God did it again though, I managed to limp to a friend's house just into the driveway before things locked solid. Anyhow, Like I said they've tried everything, including carefully tweaking push rod alignments. The lines are new also. The only thing they've been able to do is bleed the system, seemingly in vain. Many old pro mechanics have left scratching their heads. I brought down some new calipers just today, that's the last thing they haven't touched.

Well, any ideas anyone? I'm about out.
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PostSubject: Re: brake woes just killed my summer   Tue Sep 16, 2014 7:47 am

Did you install a proportioning valve when you went with the dual MC? Having the power brake booster means you should have the correct power brake pedal assy with the rod.


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PostSubject: Re: brake woes just killed my summer   Tue Sep 16, 2014 11:52 am

If you are experiencing a firm brake pedal one moment, and the next the pedal goes directly to the floor, it is usually one of two things- There is a leak in the hydraulic system, [which should be evident] or the master cylinder is faulty.

Just because the master cylinder is new or rebuilt doesn't necessarily mean that it is not defective. When I owned my own shop for close to twenty years, we had many, many instances of defective parts over the years, brand new in the box items.

---John

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PostSubject: Re: brake woes just killed my summer   Tue Sep 16, 2014 1:06 pm

i think it is the master cylinder

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PostSubject: Re: brake woes just killed my summer   Tue Sep 16, 2014 6:23 pm

X2 on the master cylinder.

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PostSubject: Re: brake woes just killed my summer   Tue Sep 16, 2014 6:34 pm

make sure the calipers aren't upside down. The bleeder should be at the top. Hoses fail from the inside out make sure they are new. Make sure the calipers are inline with the rotors too. Marc.

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PostSubject: Re: brake woes just killed my summer   Tue Sep 16, 2014 11:12 pm

Marc, i was really tired once and put the right caliper on the left side and the bleeder was on the bottom, i spent hours trying to figure out why the brakes wouldnt bleed

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PostSubject: Re: brake woes just killed my summer   Wed Sep 17, 2014 5:41 am

Bloodhound1958 wrote:
Did you install a proportioning valve when you went with the dual MC? Having the power brake booster means you should have the correct power brake pedal assy with the rod.


Yup, we have tried 3 of them (prop valves) and the MC is a gm unit, and the booster is a gm style universal, so the 58 power unit pedal and pushrods are probably not the issue. We have an adjustable one installed, and have tried a few others and have paid careful attention to push rod alignments both from the pedal and the booster. The booster and MC have also been replaced 3 times each.
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PostSubject: Re: brake woes just killed my summer   Wed Sep 17, 2014 5:45 am

Big M wrote:
If you are experiencing a firm brake pedal one moment, and the next the pedal goes directly to the floor, it is usually one of two things- There is a leak in the hydraulic system, [which should be evident] or the master cylinder is faulty.

Just because the master cylinder is new or rebuilt doesn't necessarily mean that it is not defective. When I owned my own shop for close to twenty years, we had many, many instances of defective parts over the years, brand new in the box items.

---John

Any thoughts coming from you are much appreciated. We suspected the same. We tried more than three of them. And no leaks evident.
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PostSubject: Re: brake woes just killed my summer   Wed Sep 17, 2014 5:48 am

58belvedere wrote:
make sure the calipers aren't upside down.  The bleeder should be at the top.  Hoses fail from the inside out make sure they are new.  Make sure the calipers are inline with the rotors too. Marc.

I mentioned that. They said they checked. The hoses are a good thought. They're practically new, but meh. Thanks
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PostSubject: Re: brake woes just killed my summer   Wed Sep 17, 2014 6:33 am

"The lines are new also." But you meant the hoses are new? Marc.

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PostSubject: Re: brake woes just killed my summer   Mon Sep 29, 2014 3:05 am

well the brakes seem to be working. I insisted we replace the calipers, and now all seems well. The original ones I had on there were second rate. Sprung for the good stuff this time. Computer industry wisdom: Garbage in, garbage out.

buuut I just had a minor dash fire. Heh:) we'll keep you all posted.
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PostSubject: Re: brake woes just killed my summer   Mon Sep 29, 2014 11:55 pm

thats awesome that you found the brake problem

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PostSubject: Re: brake woes just killed my summer   Tue Sep 30, 2014 11:28 am

Yay on the brake repair, but Boo on the dash fire!!

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PostSubject: Re: brake woes just killed my summer   Wed Oct 15, 2014 4:37 am

Just a heads up: the dash fire damage has been put right: better than right. A wiring guru friend did his thing and "she is perfecto now." It looks to have been a nasty short that occured while I was trying to unbolt a toggle switch from the dash. Thank God it wasn't as serious as it could have been. Memo to self ALWAYS disconnect the battery even for "simple" stuff! p.s you bloody idiot!
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