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Author
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Topic: brake pedal hard ????? poor stoping
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VENOMUS PONY 5.0
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Member # 7785
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posted
 
 
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.
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If You Want More Inches - Stroke It!!!
Mystery stang in the works..
Posts: 1602 | Registered: Jul 2007
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93bluecoupe
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Member # 9681
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posted
You maybe need to keep bleeding them
did you bleed the new master cylinder?
Posts: 273 | From: Melolambes | Registered: Dec 2009
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Adam5.0
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Member # 6995
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posted
adjust the pushrod right?
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want something old and japanese
Posts: 1609 | From: Brentwood | Registered: Aug 2006
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CAStang
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Member # 9568
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posted
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 ]
Posts: 351 | From: Santa Clara | Registered: Nov 2009
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username1822
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Member # 8583
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posted
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
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95 GT
Posts: 324 | From: Modesto | Registered: Aug 2008
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VENOMUS PONY 5.0
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Member # 7785
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posted
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.
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If You Want More Inches - Stroke It!!!
Mystery stang in the works..
Posts: 1602 | Registered: Jul 2007
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username1822
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Member # 8583
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posted
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 ]
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95 GT
Posts: 324 | From: Modesto | Registered: Aug 2008
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Blind
2.3L
CAFords OG
Member # 3052
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posted
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?
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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2T0NE
Go 49ers
Member # 4216
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posted
cobra calipers front svo in rear and stock cam...from what i know...everything was working fine until the new booster was put in
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Originally posted by x Raelsmar x:
Can't wait till the Giants lose tomorrow night so all you Giants fans are forced to shut the fuck up.
Posts: 14676 | From: 760 carlsbad | Registered: Mar 2004
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username1822
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Member # 8583
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posted
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 ]
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95 GT
Posts: 324 | From: Modesto | Registered: Aug 2008
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Blind
2.3L
CAFords OG
Member # 3052
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posted
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.
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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username1822
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Member # 8583
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posted
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 ]
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95 GT
Posts: 324 | From: Modesto | Registered: Aug 2008
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VENOMUS PONY 5.0
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Member # 7785
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posted
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.
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If You Want More Inches - Stroke It!!!
Mystery stang in the works..
Posts: 1602 | Registered: Jul 2007
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CAStang
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Member # 9568
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posted
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???
Posts: 351 | From: Santa Clara | Registered: Nov 2009
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