LT1 problems
Thread Starter
TECH Enthusiast
Joined: Apr 2004
Posts: 577
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LT1 problems My buddie just installed a 383 stroker in his 1995 firehawk. Once all said and done, the brakes were not working, no pressure even with the brakes blead. The only thing i can think of is that his master cyclinder is shot. But, this car only had 40,000 miles on the stock master cyclinder. Any help would be great, i know its not an LS1, but if there is one place to ask, its this site.
On The Tree
Joined: Jan 2004
Posts: 188
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From: Houston/ Austin, TX
Well this is the story (its my car)
Got the car running, had air in the lines from install (pulled K-member)... drove it a little (very slowly) and the brakes did nothing. I had a leak and air in the lines. Prolly ran the master cylinder dry.
Then bled the system properly.
Now it holds weird pressure (power brakes are working). The pedal falls pretty fast. If you apply firm pressure, then it holds... if its weak pressure, then it goes straight to the floor. Sometimes it will also lock up and not release brake pressure from the calipers until I push the pedal slowly all the way to the floor and it will release it.
Im swapping the master tonight. Ill keep you posted.
Got the car running, had air in the lines from install (pulled K-member)... drove it a little (very slowly) and the brakes did nothing. I had a leak and air in the lines. Prolly ran the master cylinder dry.
Then bled the system properly.
Now it holds weird pressure (power brakes are working). The pedal falls pretty fast. If you apply firm pressure, then it holds... if its weak pressure, then it goes straight to the floor. Sometimes it will also lock up and not release brake pressure from the calipers until I push the pedal slowly all the way to the floor and it will release it.
Im swapping the master tonight. Ill keep you posted.
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TECH Enthusiast
Joined: May 2005
Posts: 669
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From: Charlotte, NC
if it's a booster issue the brakes will be hard as a rock..
Did you bleed the ABS unit? cycle the key several times to prime the pump. Then open the bleeder on the pump for the rear, press pedal to the floor and hold, close bleeder, let pedal up, open bleeder, pedal down, close bleeder, pedal up. Repeat that on both bleeders with the key on.
After that bleed all 4 wheels again with the car running or key on starting at the right rear, then left rear, then right front then left front. if STILL it's not right then I suppose the MC could be bypassing and causing your issue.
Did you bleed the ABS unit? cycle the key several times to prime the pump. Then open the bleeder on the pump for the rear, press pedal to the floor and hold, close bleeder, let pedal up, open bleeder, pedal down, close bleeder, pedal up. Repeat that on both bleeders with the key on.
After that bleed all 4 wheels again with the car running or key on starting at the right rear, then left rear, then right front then left front. if STILL it's not right then I suppose the MC could be bypassing and causing your issue.