No Brakes
Thread Starter
Advanced
Joined: Apr 2016
Posts: 53
Likes: 2
No Brakes
74 with power brakes. Pedal goes to the floor. Bled the brakes many times-no air in the system. Replaced master cylinder and added electric vacuum pump to make more vacuum. Still no pedal. Any ideas?
Melting Slicks
Joined: Sep 2016
Posts: 3,004
Likes: 104
From: NC
If pedal goes to the floor it's not the booster.
If system not losing fluid the MC is wither bad/wrong or needs bench bled as you have air or MC is bad.
Why did you replace all these parts and was there an issue before?
If system not losing fluid the MC is wither bad/wrong or needs bench bled as you have air or MC is bad.
Why did you replace all these parts and was there an issue before?
Race Director
Joined: Apr 2009
Posts: 19,294
Likes: 2,754
From: Charlotte NC
What method are you using to bleed the brakes???
Did you bench bleed the master cylinder correctly???
Did you check and verify the adjustment pin in the brake booster is correct to the previous master cylinder and the new one...especially if this problem was always present???
Does the pedal ALWAYS go to the floor...even when the engine is NOT running????
DUB
Did you bench bleed the master cylinder correctly???
Did you check and verify the adjustment pin in the brake booster is correct to the previous master cylinder and the new one...especially if this problem was always present???
Does the pedal ALWAYS go to the floor...even when the engine is NOT running????
DUB
Thread Starter
Advanced
Joined: Apr 2016
Posts: 53
Likes: 2
What method are you using to bleed the brakes???
Did you bench bleed the master cylinder correctly???
Did you check and verify the adjustment pin in the brake booster is correct to the previous master cylinder and the new one...especially if this problem was always present???
Does the pedal ALWAYS go to the floor...even when the engine is NOT running????
DUB
Did you bench bleed the master cylinder correctly???
Did you check and verify the adjustment pin in the brake booster is correct to the previous master cylinder and the new one...especially if this problem was always present???
Does the pedal ALWAYS go to the floor...even when the engine is NOT running????
DUB
I believe I bench bled the MC correctly.
Pin in booster was set at about 1/16 inch clearance.
Pedal goes to floor even without engine running.
Do you think the pro portioning valve could be bad? After all, it's 40 yrs old.
Thx, Bob
Last edited by Cigars4me; Sep 24, 2016 at 07:34 PM.
Melting Slicks
Joined: Sep 2016
Posts: 3,004
Likes: 104
From: NC
Bad Proportion valve wont cause this issue. Basically Its just a distribution block with a sensor that slides to a side if you have loss of pressure and sets the light off
MC is the issue, has air/needs bench bled again or just bad. Not unheard of to have new MC be bad out of box either.
MC is the issue, has air/needs bench bled again or just bad. Not unheard of to have new MC be bad out of box either.
Safety Car
Joined: Nov 2008
Posts: 3,717
Likes: 551
From: Seattle Washington
Pump, hold and crack bleeder. All air was removed, I'm sure.
I believe I bench bled the MC correctly.
Pin in booster was set at about 1/16 inch clearance.
Pedal goes to floor even without engine running.
Do you think the pro portioning valve could be bad? After all, it's 40 yrs old.
Thx, Bob
I believe I bench bled the MC correctly.
Pin in booster was set at about 1/16 inch clearance.
Pedal goes to floor even without engine running.
Do you think the pro portioning valve could be bad? After all, it's 40 yrs old.
Thx, Bob
Racer
Joined: Dec 2014
Posts: 374
Likes: 42
From: Coldwater Mi
Didja bleed BOTH bleeders on the rears?? U sure the rubber lines at the back aren't collapsing? I replaced those, as well as the steel lines going from the rubber lines to the calipers....used stainless lines.
I bled my rears all by myself....used a jar w/ clear tubing coming from caliper into the jar so I could see the air or fluid coming out of calipers...I let the fluid gravity flow thru the caliper to ensure that the air was out of the system at least to the calipers first. Used a length of 2x4 to keep pressure on brake pedal against the seat.
I've had kikazz pedal ever since!!
I bled my rears all by myself....used a jar w/ clear tubing coming from caliper into the jar so I could see the air or fluid coming out of calipers...I let the fluid gravity flow thru the caliper to ensure that the air was out of the system at least to the calipers first. Used a length of 2x4 to keep pressure on brake pedal against the seat.
I've had kikazz pedal ever since!!
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