Brakes, Round 3. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-29-2004, 11:48 PM   #1
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Default Brakes, Round 3.

I was BS'n with one of the local mechanic'*, He said that my brake problems would probably be caused by air in the PMV getting pumped into my lines, Hence whenever I hit it hard my pedal feel gets worse. Said he got alot of these complaints and the mostly happened after people changed the MC.. So, I asked him how he got the air out of the PMV, He said to just try to lock up the brakes on some gravel, Bled'em, repeat.

Now, I figured there was no harm to be done by locking up the brakes so I went over to the closet gravel lot and tried to lock them up, Wow. Definatly some air in my lines now. I was also going to swap out my vacuum booster because i figured the shaft was too short, which would cause my pedal to never come to full height. Once I got under the dash to remove the bolts though, I found that at some point i had cracked my brake pedal and bent the heck out of it. Luckily I kept the pedal from the 94, They look exactly the same, I'll be installing the new pedal, stock VB, bench bleeding the MC and bleeding from there on out. Hopefully this should end my braking problems.
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Old 10-30-2004, 05:33 AM   #2
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Braking much during Auto X huh? Damn braking a pedal...

Glad to hear you're brake woes might be near an end. Did you ever replace the lines? I'm considering doing mine next spring.
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Old 10-31-2004, 06:29 PM   #3
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This is nice. I've got the VB, MC, and pedal back in. I haven't even bled it yet and I already love the pedal feel. The brake pedal now sits 5" off the floorboard versus the 1" before. Now I've just got to put the other two VB bolts on (I was excited to try it) put the Steering column back up, Install the IP, and giv'er a quick test drive. Then of course bleed the brakes.

I went to four different reputable shops, And Pete Mankins Pontiac in the last year trying to figure this out, all of those well trained people... and a hick from a little bitty shop knew how to fix it.... Crazy world...

Jason, New lines went on three or four weeks ago, Still looking for some SS/Teflon lines... I'm getting very good at bleeding the brakes....
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Old 10-31-2004, 07:19 PM   #4
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God I need more tools.... I just fabbed a spacer from an old 1/2" nut, using a 24V cordless drill...
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Old 10-31-2004, 09:02 PM   #5
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Hmm... Got it put together enough to safely drive, Went for a run around the block. At the slightest touch of the pedal the VB pulls it down far enough to stop the car rather quickly from 30mph. Gonna have to do a little Section 5 reading....
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Old 10-31-2004, 09:08 PM   #6
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i knew that the shorter MC that was on your car would cause problems
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Old 10-31-2004, 09:58 PM   #7
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I've got a brand new 8" MC installed, It'* bench bled but the lines still need bled. I'm thinking the VB return spring is weak or the shaft is damaged. Gonna have to switch out the VB with the one from the 94, The bell is longer but the shafts are the same.
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Old 10-31-2004, 11:19 PM   #8
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Oh bleeding these lines is pretty easy with my Mity Vac setup, dunno what you're using.

I'll be interested on metal lines as well.
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Old 11-01-2004, 07:45 AM   #9
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Just fab up your own. Go to Advanced auto and ask for "GM Bubble Flare" lines. You can even bend the damn things with your hand! Grab a couple fittings to hook them all together, and you are done.


-justin


They're a little hard to fab up, Stainless Steel Braided Flex lines take a special tool to make
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Old 11-01-2004, 11:01 PM   #10
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Justin, It'* a little hard to make your own Stainless Steel Braided Flex lines

Anyway, Had a little time and got the VB swapped, This is brakes. The car is actually fun to drive now, instead of the fear of running into something... Still have to bleed them a few more times, But I'm now sure that it probably wasnt a bad MC in the first place, It was probably the air in the PMV.
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