stupid brakes
#439335
April 22, 2015 01:02 am UTC
April 22, 2015 01:02 am UTC
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Joined: Aug 2009
Posts: 4,783 Belleville Ontario
Jay Stacey
OP
Senior Member, with Far TOO Much Time on Their Hands
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OP
Senior Member, with Far TOO Much Time on Their Hands
Joined: Aug 2009
Posts: 4,783
Belleville Ontario
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Ok.. On her 1g... With the car off, i have good solid pedal. Seems perfect. As soon as I start the car, the pedal will almost hit the floor, and wont lock the wheels. I have changed the master cylinder, rotors and pads, blead the lines over and over, and nothing is helping.
11.45@125, stock bottom end 6bolt 2g head. 272 hks cams. Holset hx35 Backyard biult!!
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Re: stupid brakes
[Re: Jay Stacey]
#439336
April 22, 2015 01:40 am UTC
April 22, 2015 01:40 am UTC
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Joined: Oct 2010
Posts: 9,968 Caledon, Ontario, Canada
Bryan Lawrence
Senior Member, with Far TOO Much Time on Their Hands
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Senior Member, with Far TOO Much Time on Their Hands
Joined: Oct 2010
Posts: 9,968
Caledon, Ontario, Canada
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If the booster diaphragm was toast would that be the symptom? Seems to be the only thing you haven't touched.
Also how did you bleed them? Also master cylinder is brand new or a used known working piece?
"Old Blue" 91 Talon TSi AWD "Super Enthusiast" 91 Talon TSi AWD Checkout DSMFAQ.com!
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Re: stupid brakes
[Re: Jay Stacey]
#439351
April 22, 2015 03:13 pm UTC
April 22, 2015 03:13 pm UTC
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Joined: Oct 2010
Posts: 9,968 Caledon, Ontario, Canada
Bryan Lawrence
Senior Member, with Far TOO Much Time on Their Hands
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Senior Member, with Far TOO Much Time on Their Hands
Joined: Oct 2010
Posts: 9,968
Caledon, Ontario, Canada
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I was just spit balling based on what other people with the same issue were saying.
Try holding the pedal down and then turning the car on, if it changes the situation than I would say something with the booster
"Old Blue" 91 Talon TSi AWD "Super Enthusiast" 91 Talon TSi AWD Checkout DSMFAQ.com!
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Re: stupid brakes
[Re: Jay Stacey]
#439354
April 22, 2015 07:05 pm UTC
April 22, 2015 07:05 pm UTC
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Joined: Aug 2014
Posts: 121 Cornwall, Ontario
Bryan OShaughnessy
Regular Member
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Regular Member
Joined: Aug 2014
Posts: 121
Cornwall, Ontario
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A booster, if defective, would cause a stiff pedal.
Your going to have to break this down systemically. Buy some brake fitting plugs (or make them, m10x1.25 IIRC) and seal off the outputs from the MC, then Give it a try. If the pedal is at all soft, it's the MC. Is it a brand new or rebuilt MC? I've purchased "new" rebuilt MC's that had bad internal piston seals (both front and rear pistons) that caused this problem.
If it's nice and stiff, you'll have to then move onto the individual calipers. If you still have the stock rubber brake hoses you can pinch them (I used hemostat forceps) and try each corner to see if the brakes feel stiffer when one is pinched off to locate the culprit.
Does it have ABS? If so, the pumps have to be bled as well.
Good luck man
Last edited by Bryan OShaughnessy; April 22, 2015 07:06 pm UTC.
1989 Dodge Colt GT 4G63T 16G
PHP: 1
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Re: stupid brakes
[Re: Jay Stacey]
#439373
April 23, 2015 02:33 am UTC
April 23, 2015 02:33 am UTC
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Joined: Aug 2014
Posts: 121 Cornwall, Ontario
Bryan OShaughnessy
Regular Member
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Regular Member
Joined: Aug 2014
Posts: 121
Cornwall, Ontario
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The only way it could be the calipers is if the seal around the piston is leaking fluid into the dust boot. Brake fluid evaporates quickly too.
It does sound more like a master cylinder issue to me but brake issues are such a PITA sometimes.
1989 Dodge Colt GT 4G63T 16G
PHP: 1
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Re: stupid brakes
[Re: Jay Stacey]
#439389
April 23, 2015 01:13 pm UTC
April 23, 2015 01:13 pm UTC
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Joined: Aug 2014
Posts: 121 Cornwall, Ontario
Bryan OShaughnessy
Regular Member
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Regular Member
Joined: Aug 2014
Posts: 121
Cornwall, Ontario
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One other thing to do, after you bleed the brakes, engage the e brake a bunch of times. it's the back brakes that control your pedal height. This will get the pads to snug up the rotors. Then bleed again.
Last edited by Bryan OShaughnessy; April 23, 2015 01:16 pm UTC.
1989 Dodge Colt GT 4G63T 16G
PHP: 1
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