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Old 12-08-2006, 08:01 PM   #1
darkmist2k1
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Member#: 31364
Join Date: Jan 2003
Chapter/Region: Tri-State
Location: jersey
Vehicle:
Ver6 Trek and couple
bottle of gatorade 4boost

Default need help diagnosis my brakes

i have a 93 turbo legacy sedan

my brake pedal is soft.. i tried bleeding them twice.. still soft.. i change the master cylinder and bled it twice again and its still soft...(while it was bleeding the pedal is really hard.. as soon as starts the car pedal become really soft)

the only way for me to get some brake pressure while driving is to pump it two time then i the brake actually bites( at 30 percent on the pedal) .. if not i have to press down like 80 percent before i get to slow down

my pads are good.. rotor are good.. inspected my hoses.. nothing is leaking..

any susgestion?

Sunny
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Old 12-08-2006, 08:12 PM   #2
chrisarella
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Sounds like your master cylider is on it's way out.

Last edited by chrisarella; 12-08-2006 at 08:13 PM.
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Old 12-08-2006, 08:26 PM   #3
Major Johnson
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If you already changed it, isn't there a slave for the brake system as well? Try that and check over all of the hoses and I mean all of them. Just today I found out one of my ABS steel lines was leaking brake fluid.
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Old 12-08-2006, 09:50 PM   #4
darkmist2k1
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Ver6 Trek and couple
bottle of gatorade 4boost

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no leak from the lines... i just change the brake master cylinder.. brand spanking new!!
never heard of brake slave cylinder.. if so.. tell me where it is!!!
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Old 12-09-2006, 12:52 AM   #5
AKESREX
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2002 WRX
P silver -original owner

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Ok, this will sound wacked out I'm sure. It IS possible to take a master
cylinder out of the box (new, not remanufactured) and have it be
defective. I've seen it in the domestic side of the business and on the
import side as well. (Wagner was the one and Autospecialty was the other)
I've seen it on at least 5 occasions, in about that many years.
If "pumping" up the pedal gives you brakes- you've got a bypassing
master cylinder. (internal fault in the master). In the case of a bypassing
master, this "solution" of pumping the brake pedal will work for several
days. If you have an external leak in the system, pumping up the pedal will
only work until the master cyl is dry.
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Old 12-09-2006, 12:44 PM   #6
darkmist2k1
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bottle of gatorade 4boost

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hmmm... maybe defective.. but seems like more a brake booster or vacuum problem.. any other suggestions
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Old 12-09-2006, 02:11 PM   #7
AKESREX
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2002 WRX
P silver -original owner

Default Possible vacuum booster issue.....

Ok, here's how to check that out.....
With the engine off, pump the brake pedal several times to bleed off
all the vacuum in the booster and all the power assist. Lightly press
on the brake pedal and start the engine. The brake pedal should
drop slightly under your foot if the booster is working properly. If
there is no pedal drop, the booster is not working.
Boosters are usually replaced and not repaired..... unless you
know someone and the unit can physically be repaired.
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