Sitting at lights or junctions..brake pedal slowly goes down
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- bhm1712
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Sitting at lights or junctions..brake pedal slowly goes down
Am i right in what i think that if the brake pedal slowly finds its way to the floor when you sit at lights or a junction with the foot on the pedal then its the master cylinder leaking internally?
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Re: Sitting at lights or junctions..brake pedal slowly goes
Could be, or air in system. Might be worth bleeding first to see if this cures it
Membership no: 20184 James Little C
With an official 325 horse power and 405 lbs of torque
With an official 325 horse power and 405 lbs of torque
- bhm1712
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Re: Sitting at lights or junctions..brake pedal slowly goes
cheers, will do.
Master cylinder fitted about 5 years ago so id expect it to last longer, but the car did sit for almost 2 years so that may have reduced its life?
Ill have a go at bleeding first, and then at least if its not that, the bleed nippled will be freed off enough for when i do the MC.
Master cylinder fitted about 5 years ago so id expect it to last longer, but the car did sit for almost 2 years so that may have reduced its life?
Ill have a go at bleeding first, and then at least if its not that, the bleed nippled will be freed off enough for when i do the MC.
Ian Hopkinson - Membership Manager & Forum Administrator
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- bhm1712
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Re: Sitting at lights or junctions..brake pedal slowly goes
I suppose it could be...ill have to check.
Ian Hopkinson - Membership Manager & Forum Administrator
Northern England & Midlands Rep
Northern England & Midlands Rep
Re: Sitting at lights or junctions..brake pedal slowly goes
if there was moisture in the brake fluid then standing unused could cause rust pitting in master cylinder bore making it leak a bit
assume you have checked for leaks and fluid loss
assume you have checked for leaks and fluid loss
Re: Sitting at lights or junctions..brake pedal slowly goes
vac. pipe shouldn't cause pedal creep
- bhm1712
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Re: Sitting at lights or junctions..brake pedal slowly goes
yes i have checked for leaks and cant see anything obvious, although i have not had chance to remove the brake drums yet to see if the wheel cylinders are leaking into the drums. Thats a job for this weekend im hoping. i did replace the wheel cylinders at the same time as the MC but i know these things fail... the fluid levels are ok so im assuming that also points to no leaks.
Ian Hopkinson - Membership Manager & Forum Administrator
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Re: Sitting at lights or junctions..brake pedal slowly goes
is it worse if you slowly apply the brakes till on, than if you brake hard and hold pressure on?
- bhm1712
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Re: Sitting at lights or junctions..brake pedal slowly goes
Yes I believe so, if I brake hard it's hardly noticeable it's mostly when slowing down gradually to a set of lights and then waiting with the brakes on.
Ian Hopkinson - Membership Manager & Forum Administrator
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Re: Sitting at lights or junctions..brake pedal slowly goes
sounds like master cylinder
- bhm1712
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Re: Sitting at lights or junctions..brake pedal slowly goes
I've had a drive tonight and it's not quite like I thought - pedal generally feels vague unless I pump it, perhaps you would call it spongy. If I pump it it's fine until I come to a stop and then it goes down slowly to the bottom of the pedal stroke.
Still points to master?
Still points to master?
Ian Hopkinson - Membership Manager & Forum Administrator
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Re: Sitting at lights or junctions..brake pedal slowly goes
dose really
spongy could be air in system, but if MC is good and level ok it shouldn't get air in it
spongy could be air in system, but if MC is good and level ok it shouldn't get air in it
- bhm1712
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Re: Sitting at lights or junctions..brake pedal slowly goes
well you gotta love doing the master cylinder not messy at all!
Ill get one ordered up, if i remember it took me about 30 mins last time to pre bleed and fit the MC, and then 3 hours to bleed the brakes as the nippled were solid! hope they are easier to loosen this time!
Ill get one ordered up, if i remember it took me about 30 mins last time to pre bleed and fit the MC, and then 3 hours to bleed the brakes as the nippled were solid! hope they are easier to loosen this time!
Ian Hopkinson - Membership Manager & Forum Administrator
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Re: Sitting at lights or junctions..brake pedal slowly goes
you could try bleeding it, might be lucky and flush some muck out
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Re: Sitting at lights or junctions..brake pedal slowly goes
if you pre bleed the master cylinder on the bench and not on the car you could be luck an not have to bleed the system or at lest not have to bleed the system to much
- bhm1712
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Re: Sitting at lights or junctions..brake pedal slowly goes
Jeff73 wrote:if you pre bleed the master cylinder on the bench and not on the car you could be luck an not have to bleed the system or at lest not have to bleed the system to much
Yes I'm going to do this, last time the master cylinder came with 2 adapters and pipes which fed back into the reservoir for bench bleeding. I hope the new one comes with those as well.
Ian Hopkinson - Membership Manager & Forum Administrator
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Re: Sitting at lights or junctions..brake pedal slowly goes
if you pre bleed the master cylinder on the bench and not on the car you could be lucky an not have to bleed the system or at lest not have to bleed the system to much
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