This is topic brake pedal hard ????? poor stoping in forum Tech Talk at Northern California Ford Owners  .


To visit this topic, use this URL:
https://californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=022677
Posted by VENOMUS PONY 5.0 (Member # 7785) on :
 
so i chaged my brake booster and master cylinder from a 95 mustang... i have a 89 foxbody. the booster is brand new. i had the whole setup in my other foxbody minus the booster and everything worked good. so my problem is my pedal is hard but the stopping power sucks real bad any suggestions.
 
Posted by 93bluecoupe (Member # 9681) on :
 
You maybe need to keep bleeding them
did you bleed the new master cylinder?
 
Posted by Adam5.0 (Member # 6995) on :
 
adjust the pushrod right?
 
Posted by CAStang (Member # 9568) on :
 
I have the same problem, it started when I upgraded my calipers and rotors to the 13" Cobra setup. (Foxbody) Anybody have a link on proper pushrod adjustment steps?

[ July 15, 2010, 11:00 AM: Message edited by: CAStang ]
 
Posted by username1822 (Member # 8583) on :
 
quote:
Originally posted by CAStang:
I have the same problem, it started when I upgraded my calipers and rotors to the 13" Cobra setup. (Foxbody) Anybody have a link on proper pushrod adjustment steps?
I did the cobra 13" brakes on my 95 and I needed to use a 94-95 cobra master cylinder. The bore size is different so I had that nasty hard pedal problem until I put in the correct master.

Here is how you are supposed to adjust the rod...

http://www.maximummotorsports.com/content/install/pdf/brakes/MMBAK-1r1.pdf
 
Posted by 94 N.C.F. GT (Member # 3946) on :
 
What did you guys use for the ebrake setup
 
Posted by VENOMUS PONY 5.0 (Member # 7785) on :
 
so how do i adjust it and to what setting.... can i find that info anywhere? do i just twist the rod left or right? does the rod go in and out and iam i adjusting that portion of it????? any info would be great help.
 
Posted by username1822 (Member # 8583) on :
 
I just posted a link above on how to adjust it.

Its a hollow shaft with a threaded rod in it. You want it to be sitting almost right against the inside of the master cylinder when its all bolted up (which is why its easier if you measure than just guessing).

If your brake pedal is hard, that means the rod is too long, you would need to shorten it (thread it in).

[ July 15, 2010, 04:23 PM: Message edited by: username1822 ]
 
Posted by Blind (Member # 3052) on :
 
there's more to it than just the rod.

what calipers are you using, were you able to turn in the brake calipers easily when you installed the pads on them? A frozen caliper would make a hard pedal with shitty brakes.

how much vacuum does your motor pull? Is the car boosted and have a check valve on the brake booster so it doesn't lose the vacuum reserve?
 
Posted by 2TONE (Member # 4216) on :
 
cobra calipers front svo in rear and stock cam...from what i know...everything was working fine until the new booster was put in
 
Posted by username1822 (Member # 8583) on :
 
quote:
Originally posted by Blind:
there's more to it than just the rod.

what calipers are you using, were you able to turn in the brake calipers easily when you installed the pads on them? A frozen caliper would make a hard pedal with shitty brakes.

how much vacuum does your motor pull? Is the car boosted and have a check valve on the brake booster so it doesn't lose the vacuum reserve?
Yes, other things can cause a hard pedal, but if you read his post, he installed a new booster and master and the problem started, neither of which will spontaniously cause a "frozen caliper". So improper adjustment would be the most obvious solution.

[ July 15, 2010, 06:09 PM: Message edited by: username1822 ]
 
Posted by Blind (Member # 3052) on :
 
quote:
Originally posted by username1822:
quote:
Originally posted by Blind:
there's more to it than just the rod.

what calipers are you using, were you able to turn in the brake calipers easily when you installed the pads on them? A frozen caliper would make a hard pedal with shitty brakes.

how much vacuum does your motor pull? Is the car boosted and have a check valve on the brake booster so it doesn't lose the vacuum reserve?
Yes, other things can cause a hard pedal, but if you read his post, he installed a new booster and master and the problem started, neither of which will spontaniously cause a "frozen caliper". So improper adjustment would be the most obvious solution.
it was all working fine in a different car, maybe those parts all sat around for a long time and a caliper froze up, or the new car has a big vacuum leak, etc.
 
Posted by username1822 (Member # 8583) on :
 
quote:
Originally posted by 2TONE:
cobra calipers front svo in rear and stock cam...from what i know...everything was working fine until the new booster was put in
If it was working fine before the new booster, then the rod adjustment is the problem.

[ July 15, 2010, 06:23 PM: Message edited by: username1822 ]
 
Posted by VENOMUS PONY 5.0 (Member # 7785) on :
 
iam going to go with the adjustment of the rod. the parts only sat for 2 days like i said everything was working fine unill i put that new booster in iam going to adjust that... iam going to keep you guys posted.
 
Posted by CAStang (Member # 9568) on :
 
quote:
Originally posted by VENOMUS PONY 5.0:
iam going to go with the adjustment of the rod. the parts only sat for 2 days like i said everything was working fine unill i put that new booster in iam going to adjust that... iam going to keep you guys posted.
Any updates???
 




Fueled by Ford Mustang Owners
on CaliforniaFords.com