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Pump pedal 

 

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 Post subject: Pump pedal
Posted: Tue Aug 09, 2005 12:13 am 
Stock as a Rock
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I've just put slotted rotors and new pads on the front of my car, and was expecting the pedal to be nice and firm, but instead the pedal seems to travel a long way. If I pump the pedal it becomes firm.

I also replaced caliper kits and wheel bearings. I've inspected the system and there are no leads from the work I have done, and there appears to be no air in the lines.

What would be causing this?

Would it be the master cylinder? If so what will I need to do and how much?
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Posted: Tue Aug 09, 2005 1:04 pm 
Getting Side Ways
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the pedal will not be firm from the first pump.
to check master cylinder condition pump until pedal is firm with the car off, keep your foot on the pedal and start car if it goes in the master cylinder is ok.
did you change your brake fluid?

 

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Posted: Tue Aug 09, 2005 1:06 pm 
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msman wrote:
the pedal will not be firm from the first pump.
to check master cylinder condition pump until pedal is firm with the car off, keep your foot on the pedal and start car if it goes in the master cylinder is ok.
did you change your brake fluid?


Yeah I changed the brake fluid, but I will do as you have said and see?

Any other ideas/suggestions?
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Posted: Tue Aug 09, 2005 1:32 pm 
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did you put hard or soft pads in? it makes a bit of difference in pedal travel...

 

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Posted: Tue Aug 09, 2005 2:40 pm 
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Definately sounds like air in your lines. Did you bleed them corectly.

 

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Mods: Crow Stg3, Chiptorque Dynotune. Lukey Exhaust. DBA slotted rotors, EBC Pads. Whiteline Low Susp. EL GT Swaybars, ROH Envy 17 x235 wheels. Vehicle Datalogger Display V2.0,

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Posted: Tue Aug 09, 2005 5:48 pm 
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mr_sperm1 wrote:
did you put hard or soft pads in? it makes a bit of difference in pedal travel...


I put Ferodo Excel pads in, whether they are hard or soft I don't know.

I'm going to bleed the brakes again the arvo and see how that goes, but I'm a little concerned it may be the master cylinder.
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Posted: Tue Aug 09, 2005 6:32 pm 
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If the master cylinder was stuffed then pumping wouldn't make it firmer. I assume it all worked fine before. If so must be air in lines.

 

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Manual EL Gli.
Mods: Crow Stg3, Chiptorque Dynotune. Lukey Exhaust. DBA slotted rotors, EBC Pads. Whiteline Low Susp. EL GT Swaybars, ROH Envy 17 x235 wheels. Vehicle Datalogger Display V2.0,

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Posted: Tue Aug 09, 2005 7:56 pm 
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I've just bled the brakes again, and remove a small amount of air, which has dramatically improved the pedal length. I may do it again just to ensure it's right.

Thanks for all the help and advice.
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