Locking Brakes
11-20-2004, 11:15 AM
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Engine: L98 5.7
Locking Brakes
Can anyone, with stock brakes. (aftermarket pads or lines are fine) able to lock all 4 tires?
My 89 GTA locks the front on hard stops but cant lock the rear for the life of me. Can anyone?
If anyone can what did you do to improve the stopping power? combo valve? aftermarket Master?
Thanks all!
My 89 GTA locks the front on hard stops but cant lock the rear for the life of me. Can anyone?
If anyone can what did you do to improve the stopping power? combo valve? aftermarket Master?
Thanks all!
11-20-2004, 11:50 AM
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Car: '87 Cam RS V6
Engine: Top Secret
Transmission: DYT700R4 custom inerts and conv.
Its a very common problem. Go to a 1LE prop valve for your year car. It will make a big improvement in stopping power.
11-20-2004, 06:36 PM
#4
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I used to be able to lock all 4, but not any longer. I need to do some work on my brakes.
11-20-2004, 10:24 PM
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Car: 1988 Formula
Engine: 355
Transmission: 6 speed
I am eliminating stock prop valve. Run the fronts straight and put wilwood adjustable on the rears. But I am also going with LS1 up front and PBRs in the rear. For just stock setup I would stick with the 1LE. I think the dealership may be your only hope on that.
11-21-2004, 10:39 AM
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Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Call Dal Slabaugh...my 1LE prop valve from GM was $55 shipped to my door. Call him or go thru GMPD.
Dal Slabaugh
Van Devere Pont-Buick-Olds
877-448-5451
Ed
Dal Slabaugh
Van Devere Pont-Buick-Olds
877-448-5451
Ed
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11-22-2004, 12:19 AM
#8
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Does the 1LE prop valve have the fitting for the brake light sensor? Does it bolt right in place of the stock valve without needing any mods to brackets, brake lines, etc??
11-22-2004, 08:17 AM
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Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Yes but you need to get the right one for your car as the brake line threads change between years.
Look here for more info:
http://www.ws6transam.org/1LEbrake.html#1LEfront
Ed
Look here for more info:
http://www.ws6transam.org/1LEbrake.html#1LEfront
Ed
11-23-2004, 01:47 AM
#10
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OK, since my car is an 88 with J65 brakes, looks like the correct combo/prop valve is p/n 14089496. I assume this valve applys more line pressure to the rear brakes than the stock J65 valve?
11-23-2004, 04:15 AM
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Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
Yep, same one I used on my '88, and I think the theory is correct.
Ed
Ed
11-23-2004, 03:29 PM
#12
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Ed, did all the stock brake lines line up correctly with the new valve, or did you have to do some bending?
11-23-2004, 09:56 PM
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Engine: L98 5.7
*update*
Well, i know why i cant lock my rear wheels. THEY DONT WORK. I was bummed out.
I was at aircare yesturday. They do a quick mechanical test, they came back and asked me if my rear brakes work. I said as far as i know. My rear wheels were on a roller (like a dyno) and they didnt brake even when floored.
Im replacing the calipers/lines imediately (5 months old, and surprise surprise still at 95%.)
Weird thing is the parking brake still works. No well. But itll hold if the hill isnt crazy steep. Hopefully this will solve the problem. Im hoping this pistons are seized or something like that. IF not ill have to find out whats going on. EVERYTHING in my braking system is new, minus the combo valve....
I was at aircare yesturday. They do a quick mechanical test, they came back and asked me if my rear brakes work. I said as far as i know. My rear wheels were on a roller (like a dyno) and they didnt brake even when floored.
Im replacing the calipers/lines imediately (5 months old, and surprise surprise still at 95%.)
Weird thing is the parking brake still works. No well. But itll hold if the hill isnt crazy steep. Hopefully this will solve the problem. Im hoping this pistons are seized or something like that. IF not ill have to find out whats going on. EVERYTHING in my braking system is new, minus the combo valve....
11-23-2004, 10:52 PM
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11-25-2004, 01:15 AM
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Engine: L98 5.7
I have an earls ss brake line kit if thats what you mean. Not installed though, well, technically they are now (along with new calipers) but i havent used it yet. The mechanic is still making sure i pass smog.
dont know what else a flexline could be.
dont know what else a flexline could be.
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