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Brake pedal will not return...stays on floor #2260165
02/26/17 11:10 PM
02/26/17 11:10 PM
Joined: Jan 2003
Posts: 410
Chicago
Lee Offline OP
mopar
Lee  Offline OP
mopar

Joined: Jan 2003
Posts: 410
Chicago
Hi

1969 Roadrunner, power drum brakes. New master, wheel cylinders, and hoses. Brakes will stop car just fine, but brake pedal will not come back up, keeping brakes applied, have to pull pedal up with your foot. Do not know the history on the car, a friend just bought it, drove off the trailer into shop for a cam change and said brake work.
Brake booster bad???

Re: Brake pedal will not return...stays on floor [Re: Lee] #2260191
02/26/17 11:49 PM
02/26/17 11:49 PM
Joined: Feb 2003
Posts: 8,658
A
Andrewh Offline
master
Andrewh  Offline
master
A

Joined: Feb 2003
Posts: 8,658
does it do it with the car off as well, or only when you have vacuum on the booster?

Re: Brake pedal will not return...stays on floor [Re: Lee] #2260200
02/26/17 11:59 PM
02/26/17 11:59 PM
Joined: Dec 2007
Posts: 18,153
Mass
DAYCLONA Offline
I Live Here
DAYCLONA  Offline
I Live Here

Joined: Dec 2007
Posts: 18,153
Mass
Originally Posted By Lee
Hi

1969 Roadrunner, power drum brakes. New master, wheel cylinders, and hoses. Brakes will stop car just fine, but brake pedal will not come back up, keeping brakes applied, have to pull pedal up with your foot. Do not know the history on the car, a friend just bought it, drove off the trailer into shop for a cam change and said brake work.
Brake booster bad???





New master?...has the booster to master pushrod airgap been adjusted properly? you'll need .020 to .060 airgap

booster5.JPGboostertoolch.JPGbooster gap.JPG
Re: Brake pedal will not return...stays on floor [Re: Lee] #2260207
02/27/17 12:10 AM
02/27/17 12:10 AM
Joined: Jan 2003
Posts: 410
Chicago
Lee Offline OP
mopar
Lee  Offline OP
mopar

Joined: Jan 2003
Posts: 410
Chicago
with engine running, pedal stays on the floor, with engine off, pedal return about half way. removed and lubed pivot bolts under dash. No help. booster push rod was adjusted correctly.

Lee

Re: Brake pedal will not return...stays on floor [Re: Lee] #2260217
02/27/17 12:30 AM
02/27/17 12:30 AM
Joined: Jan 2003
Posts: 410
Chicago
Lee Offline OP
mopar
Lee  Offline OP
mopar

Joined: Jan 2003
Posts: 410
Chicago
When I get a chance tomorrow, I will unbolt the master from the booster and see if it makes a difference.

Lee

Re: Brake pedal will not return...stays on floor [Re: Lee] #2260247
02/27/17 01:16 AM
02/27/17 01:16 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
Quote:
Brake booster bad???
thats my thought


live every 24 hour block of time like it's your last day on earth
Re: Brake pedal will not return...stays on floor [Re: Lee] #2260293
02/27/17 02:37 AM
02/27/17 02:37 AM
Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda Offline
master
70AARcuda  Offline
master

Joined: Jan 2003
Posts: 9,826
las vegas
loosen the nut on the brake pedal rod where it goes thru the brake pedal..


Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: Brake pedal will not return...stays on floor [Re: 70AARcuda] #2260303
02/27/17 03:13 AM
02/27/17 03:13 AM
Joined: Jan 2003
Posts: 410
Chicago
Lee Offline OP
mopar
Lee  Offline OP
mopar

Joined: Jan 2003
Posts: 410
Chicago
Originally Posted By 70AARcuda
loosen the nut on the brake pedal rod where it goes thru the brake pedal..


Did that.......

Lee

Re: Brake pedal will not return...stays on floor [Re: Lee] #2260306
02/27/17 03:39 AM
02/27/17 03:39 AM
Joined: Jan 2008
Posts: 2,363
Cotati, CA
Dave Hall Offline
top fuel
Dave Hall  Offline
top fuel

Joined: Jan 2008
Posts: 2,363
Cotati, CA
You might have to hone the piston in the master. If they sit long they tend to get funky in there and won't back out. Had it happen a couple times on my Mopar master I use for racing.

Last edited by Dave Hall; 02/27/17 03:39 AM.
Re: Brake pedal will not return...stays on floor [Re: Lee] #2260307
02/27/17 03:39 AM
02/27/17 03:39 AM
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
sthemi Offline
master
sthemi  Offline
master

Joined: Jun 2004
Posts: 3,319
Chicago Burbs
Might be incorrect booster or defective booster. Had a similar problem with my 79 Warlock. Needed another booster. Problem solved.







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