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Author Topic: Spongy brake pedal  (Read 1236 times)

Offline bigjeeze

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  • Model: Galaxy Mk2 Auto
  • Spec: 03 Tdi Ghia Auto
  • Region: South of England
  • Country: United Kingdom
Spongy brake pedal
« on: June 22, 2018, 10:09:39 PM »
Hi Guys

I changed my front brake pads and for the first time I didn't release the bleed nipple and just pushed the pistons back in. Once I fitted the pads I had a very spongy pedal, so I bled the brakes ( 3 times so far) but to no avail. So I thought that perhaps the dread flipped seals was the issue. I have to say that I have never seen this or heard of anyone having it but I thought sod it I'll replace the MC.  I managed to get a new one and it arrived today, I fitted it bled it 3 times but I still have the spongy pedal which slowly sinks to the floor once the engine starts.

I can only think it is air in the ABS block . Has anyone any ideas or solutions - I am getting really fed up now!!
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Offline KingyMAK

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Re: Spongy brake pedal
« Reply #1 on: June 22, 2018, 10:34:31 PM »
Sounds stupid, but did you bleed it in the correct order?

Offline johnnyroper

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  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
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Re: Spongy brake pedal
« Reply #2 on: June 23, 2018, 07:54:54 AM »
When bleeding has all the air stopped being expelled?

Prior to bleeding right after pad change did pedal sink to floor or was it just spongy? New pads are spongy until bed in especially if disks not in best of shape.

Might be worth clamping flexi Hoses 1at a time to see if that makes a difference and if you can pin it down to a particular side.




Offline bigjeeze

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  • Model: Galaxy Mk2 Auto
  • Spec: 03 Tdi Ghia Auto
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  • Country: United Kingdom
Re: Spongy brake pedal
« Reply #3 on: June 23, 2018, 12:21:33 PM »
Hi Gents
Thanks for coming back to me.

I was always told to bleed furthest from the MC first. But I read on a forum that Galaxy's should be bled nearest first. So I have tried it both ways - no difference.

I have completely changed the brake fluid- some 2 litres.

When I fitted the pads - it felt fine until I started the engine then the pedal started to sink. That's what made me re bleed and change the MC.

I have also read that some people advocate taking the car somewhere quiet and jamming the brakes on to shift any air in the ABS pump. I'm not sure that's a good idea. What do you think?


BJ

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Offline Ben g mon

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  • Spec: 2003 1.9tdi zetec
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  • Region: South West
Re: Spongy brake pedal
« Reply #4 on: June 23, 2018, 12:25:24 PM »
Be interesting to hear the answer as under the new mot rules my black brake fluid would fail. Was going to ezzibleed pressure change it at 12psi so Iím keeping an eye on this for avoidance on master seals flipping !

Offline johnnyroper

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Re: Spongy brake pedal
« Reply #5 on: June 23, 2018, 02:40:04 PM »
Is the pedal worse than when you originally had the issue? It might be worth driving somewhere quiet and seeing if it improves.

As for the black fluid I would suck it out of resavoir with syringe or alike and refill with fresh fluid,then give each corner a bleed. Personally donít use pressure bleeders I just gently pump pedal with the help of an assistant on the bleed nipple. Not had any problems with seals flippingas yet.

Offline bigjeeze

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  • Posts: 330
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  • Model: Galaxy Mk2 Auto
  • Spec: 03 Tdi Ghia Auto
  • Region: South of England
  • Country: United Kingdom
Re: Spongy brake pedal
« Reply #6 on: July 09, 2018, 09:07:45 PM »

[/quote]
Hi Gents
Thanks for coming back to me.

I was always told to bleed furthest from the MC first. But I read on a forum that Galaxy's should be bled nearest first. So I have tried it both ways - no difference.

I have completely changed the brake fluid- some 2 litres.

When I fitted the pads - it felt fine until I started the engine then the pedal started to sink. That's what made me re bleed and change the MC.

I have also read that some people advocate taking the car somewhere quiet and jamming the brakes on to shift any air in the ABS pump. I'm not sure that's a good idea. What do you think?


BJ



So far I am still unable to bleed the brakes and remove the spongy pedal.  I had a wheel sensor go faulty - which I have replaced but it still shows as faulty. Do I have to use VCDS to remove the fault or should it automatically reset?
Does no one have any idea as to what I can do to fix this?  To activate the ABS pump to get rid of air needs a full copy of VCDS  which I don't have.

Any suggestions?
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Offline johnnyroper

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Re: Spongy brake pedal
« Reply #7 on: July 09, 2018, 10:01:11 PM »
If fault has been rectified it should self clear,may need to be driven a short distance.

Might be worth seeing if anyone local has registered copy to activate ABS for you see if that helps

Offline bigjeeze

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  • Model: Galaxy Mk2 Auto
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Re: Spongy brake pedal
« Reply #8 on: July 10, 2018, 06:42:04 AM »
Thanks Johnny

I don't know anyone local with a copy.

Cheers


BJ
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Offline johnnyroper

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Re: Spongy brake pedal
« Reply #9 on: July 10, 2018, 09:25:30 AM »
Not ideal but I had similar issues gaining a pedal on my old x type jag,I ended up cracking pipes 1 at a time at ABS pump to bleed then did a full all round bleed again.

After you fitted the pads was pedal ok until you started engine? Could it just be spongy due to new pads on old disks? Have you tried clamping flexi hoses to see if pedal returns to normal?

Apologies I have not read back through thread so canít remeber what you have tried already

Offline sparky Paul

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  • Model: Galaxy Mk1
  • Spec: 99 2.3 Zetec
  • Region: East Midlands
  • Country: United Kingdom
Re: Spongy brake pedal
« Reply #10 on: July 10, 2018, 11:04:18 AM »
First of all, I agree with johnnyroper 100% about Eezibleeds and other pressure bleeders, they are nothing but trouble. I bought one nigh on 30 years ago, and never used it again - you have to be very careful indeed to avoid putting air into the fluid. Either use the two man method, or invest in a vacuum bleeder.

ABS sensor faults should clear themselves over 15mph if all is well. If you find that the fault still exists after replacing a faulty sensor, the corrosion on the caliper may not be allowing the new sensor to seat properly. Remove the sensor and clean the scale off the caliper before refitting.

The Galaxy brake hydraulics are a bugger if you get air in, it can take some shifting. If it is in the ABS block, it won't come out without performing the full bleed procedure using the ABS pump and VCDS.

Some have had success with the 'stamping on the brakes to activate the ABS multiple times' method, but there's no guarantee you will get all, or even most of the air out. What happens is the shock from the ABS actuators breaks up the air bubbles into smaller ones, so that it's easier for them to be bled out of the ABS block. You still then have to bleed immediately to stop the smaller bubbles combining again.

Offline bigjeeze

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  • Spec: 03 Tdi Ghia Auto
  • Region: South of England
  • Country: United Kingdom
Re: Spongy brake pedal
« Reply #11 on: July 12, 2018, 07:51:09 PM »
Thanks Paul.

I have now obtained a vacuum bleeder so will try that and see what happens.
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Offline bigjeeze

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  • Posts: 330
  • Thanked: 3
  • Model: Galaxy Mk2 Auto
  • Spec: 03 Tdi Ghia Auto
  • Region: South of England
  • Country: United Kingdom
Re: Spongy brake pedal
« Reply #12 on: July 22, 2018, 01:24:47 PM »
What a waste of time! The vacuum bleeder sucked in tons of air via the nipple threads - absolute crap!!
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Offline johnnyroper

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  • Posts: 2942
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  • Spec: 02 tdi 115 ghia
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Re: Spongy brake pedal
« Reply #13 on: July 22, 2018, 09:35:07 PM »
I have only used a vac bleeder after pipe change etc to get the fluid down to caliper initially,I donít think there is any substitute for the 2 man bleed like the old days.

Did you ever try clamping flexi hoses to get it down to a problem with fronts or rears?

Offline christiant

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Re: Spongy brake pedal
« Reply #14 on: July 25, 2018, 07:52:32 PM »
An old trick I personally use but you need a compressor. I have successfully bled mine using a modified cap on the tank, which has a mounted threaded tire valve on it. Just get one from breakers, drill trough the middle of it and remove the fluid level sensor, you might need to use some sealant as the bit in the middle is a bit loose. Just screw the valve tight in the whole. Screw it on the brake fluid reservoir and  apply very light air pressure to it and undo the bleed screws one at a time staring at the furthest one, gets rid of the old fluid quick and its a one man job. It definitely works really well and those vac things are a waste of time unless you have a professional one which costs a fortune.

 

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