CUTLASS Car Off Pedal Stiff Car ON Pedal builds no pressure brake light on...IM STUMPED

JD254

Not-quite-so-new-guy
Thread starter
Aug 1, 2018
19
3
Texas
I have 1986 Cutlass that brakes worked fine before i did the blazer spindle swap and installed the new calipers.the lines seem to be bled fine no issues there i have replaced the master cylinder and the brake booster and the same issue when the car is off some pressure builds up when brake pedal pumps when car is turned on pedal is a mushy as mashed potatoes for a gerber baby. Just curious what else i should look into. No visible leaks checked all hoses and cylinders. at this point its gotta be something simple i would think no about to replace proportioning valve just on a whim the same way i did the booster the master cylinder was visibly leaking. Ive never had issues bleeding any of my other older gm 80s vehicles but this one is being quite difficult. Thanks in advance.
 
Oct 14, 2008
8,256
113
Melville,Saskatchewan
Try a pressure bleeder. I put new rear lines on my 70S. It would not even pull fluid and the prop valve was functioning. It took no time at all and fluid was flowing. It will push the air right out of the system.
 
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Ribbedroof

Comic Book Super Hero
Supporting Member
Jan 4, 2009
4,509
113
Wellston, OK
Are the bleeders at the top of the caliper? Believe it or not, I've seen calipers installed with the bleeders at the bottom more than once.
 
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ELCAM

G-Body Guru
Jun 19, 2021
712
93
To bleed the proportioning valve pump and hold the pedal as in regular 2 person bleeding and loosen the tubing fitting till the oil comes out. Tighten and repeat as in regular bleeding.
 

JD254

Not-quite-so-new-guy
Thread starter
Aug 1, 2018
19
3
Texas
Try a pressure bleeder. I put new rear lines on my 70S. It would not even pull fluid and the prop valve was functioning. It took no time at all and fluid was flowing. It will push the air right out of the system.
is that the one from harbor freight that uses air compressor
 

JD254

Not-quite-so-new-guy
Thread starter
Aug 1, 2018
19
3
Texas
Are the bleeders at the top of the caliper? Believe it or not, I've seen calipers installed with the bleeders at the bottom more than once.
so they should be at the top? let me get home and double check if not i will switch them around...so with the brake bleeder being on the bottom the air cant escape? and on backwards obviousley lol
 

JD254

Not-quite-so-new-guy
Thread starter
Aug 1, 2018
19
3
Texas
Are the bleeders at the top of the caliper? Believe it or not, I've seen calipers installed with the bleeders at the bottom more than once.
ribbed roof you are my hero i had bought the stuff for this spindle swap more than year ago and it had been sitting in garage had vacation time and got it done and never occured to me that it could be upside down and it was
 
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Oct 14, 2008
8,256
113
Melville,Saskatchewan

Dayzedandkonfuzed

G-Body Guru
Feb 9, 2010
961
93
Anglemont, BC
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