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Technical Brake Problems

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Technical Brake Problems

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Stonesy

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Mar 17, 2019
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GGGrrrr!

Just replaced brake pads on 1.9 mutijet
I didn't undo the bleed nipple due to worries of it braking...
Opened cap on brake fluid "tank" and pushed fluid back.

Now i have a REALLY spongy brake pedal when the engine is running.... goes all the way down... I can pump it up and goes hard but then back to pedal on floor.
when the engine isn't running the pedal pumps up fine and stays that way..
I can hear an 'air' sound coming from near the hand brake.



I haven't got any oil leaks and tank is full.

HELP!!!
 
Yes, but maybe and it's a maybe, your old brake fluid has not been changed since new. My theory is that the brake fluid is heavily contaminated with water. And that could cause this kind of thing.
 
Bled the brakes... No difference...
Getting desperate now cos is meaning time off work... No transport.

Something as simple as changing brake pads ,I job if done lots of times...
 
My pedal was spongy after the garage changed all 4 discs and pads, over time after they bedded in it just got better..
 
Also I get the air noise when pumping my brakes, think that’s normal. (Well I hope lol)
 
I really don't feel its safe to drive around...the brake goes all the way to the bottom with very little effort... I have to pump the brake a few times to get any braking...then all the way down again..the peddle seems fine when the engine isn't running...

Please any one any ideas?

Thanks
 
Do fiat master cylinders suffer the same problems as gm (vauxhall) ones?

If you press the pedal too far, it flips the seal and ruins it on gm ones.

It's a possibility
 
But brakes pump up without the engine running so does that mean master cylinder is OK?
 
eales117 said:
My pedal was spongy after the garage changed all 4 discs and pads, over time after they bedded in it just got better..
Click to expand...

Its not unusual for some sponginess to creep in after pad change and bleeding should be part of the job to ensure things are right. Logically you are right to say it shouldn't be affected, but my experience is this is not at all unusual.

If it persists you have a caliper fault due to corroded pistons or bores and the piston seal passing over rough areas allows air into the system. Remeber the pistons on calipers move from fully extended to fully retracted when you change pads.

Calipers are made by Ferodo and can be bought direct from a Ferodo agent at very reasonable costs. Identical to the OE fitments from Fiat.
 
Another possibility that happened to me:
After the pad replacement you pushed the brake pump past it's regular use zone... if the fluid wasn't changed regularly the cylinder will rust, causing damage to the pump seal when it glides through.

Mine was soft when pressing slow and gentle, and the pedal would sink to the floor.
If i pressed hard and fast the brake pedal would be hard and wouldn't sink.

Replaced the brake pump. then all was good.
 
I had a similar problem when I changed the disks and pads on the rear. It took 4 or 5 bleeds all round the car to get a decent brake pedal.
 
Well I got some hose clamps and isolated each rear caliber... Clamped the off side rear and brakes worked fine....replaced the caliper and now all good.,didn't expect a faulty caliper to give does symptoms but hey...

Thanks for the help advice.
 
The Panda Nut said:
Its not unusual for some sponginess to creep in after pad change and bleeding should be part of the job to ensure things are right. Logically you are right to say it shouldn't be affected, but my experience is this is not at all unusual.

If it persists you have a caliper fault due to corroded pistons or bores and the piston seal passing over rough areas allows air into the system. Remeber the pistons on calipers move from fully extended to fully retracted when you change pads.

Calipers are made by Ferodo and can be bought direct from a Ferodo agent at very reasonable costs. Identical to the OE fitments from Fiat.
Click to expand...

Spot on faulty caliper.. :0)
 
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