displaying posts 1 to 14 of 14

Author Subject: Brake efficiency
deeturbo

Regular

Location: Leighton Buzzard

Registered: 22 Feb 2003

Posts: 283

Status: Offline

Post #1
Hi all,

I've notice my brakes aren't as great as other 306's I've driven.

The front calipers have been rebuilt and that made a big difference and the rears have been swapped out for new ones also made a big difference but the bite isn't there and the pedal feels a little soft at first.

The system has been bled thinking it was air but I get none.

There is no pedal creep so I'm guessing the master cylinder is ok.

Does this mean it can only be the servo that's leaking and I'll need it replacing?
Posted 2nd Feb 2017 at 22:20
RetroPug

Seasoned Pro

Location: Leicestershire

Registered: 15 Jan 2013

Posts: 2,473

Status: Offline

Post #2
Could there possibly be air trapped in the ABS pump/system? Try cycling it on some loose gravel and bleeding it again?

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Posted 2nd Feb 2017 at 23:59
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

Status: Offline

Post #3
Air still in there, hoses tired, or you have a lot of runout on your brake discs knocking the pads back (possibly from wheel bearing play if they seem square to the hubs.

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Posted 3rd Feb 2017 at 01:03
deeturbo

Regular

Location: Leighton Buzzard

Registered: 22 Feb 2003

Posts: 283

Status: Offline

Post #4
Thanks for the replies guys.

I'll try connecting up PP2k and activate the ABS pump and then try bleeding, but I have bled it loads with the easy bleed system.

If you mean the flexible pipes, all the hoses are the braided type. I'm guessing they shouldn't bulge. They seem to be in good condition.

How does a failing servo feel?
Posted 3rd Feb 2017 at 21:01
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #5
does it have a load compensator or an EBD system?

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Posted 3rd Feb 2017 at 21:08
deeturbo

Regular

Location: Leighton Buzzard

Registered: 22 Feb 2003

Posts: 283

Status: Offline

Post #6
It's phase 3 so the EBD system.
Posted 3rd Feb 2017 at 21:19
mocinim

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Location: The Darkside of bedford :)

Registered: 09 Jan 2015

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Post #7
deeturbo wrote:
It's phase 3 so the EBD system.



Ph3 EBD ph2 compensator

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Posted 3rd Feb 2017 at 22:35
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

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Post #8
deeturbo wrote:
Thanks for the replies guys.

How does a failing servo feel?


Pedal effort changes for no apparent reason usually, or you need more effort to brake at low engine revs vs high when it's leaking enough.

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Posted 3rd Feb 2017 at 23:45
deeturbo

Regular

Location: Leighton Buzzard

Registered: 22 Feb 2003

Posts: 283

Status: Offline

Post #9
Ah, thanks.

It's not that then.

Is it better to vacuum pull fluid from the bleed nipples or pressurise the reservoir to push the fluid?
Posted 4th Feb 2017 at 22:13
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

Status: Offline

Post #10
Vacuum if you can as it pulls dissolved air out of the fluid.

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Posted 4th Feb 2017 at 23:34
mocinim

Seasoned Pro

Location: The Darkside of bedford :)

Registered: 09 Jan 2015

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Post #11
I use an easy bleed kit keeps it set to around 20psi and then run around bleeding pushing the pedal and operating the rear bias valve

Take it for a drive on loose gravel operate the abs etc then another bleed to get the last of the air.
works well for me Thumbs up

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Posted 5th Feb 2017 at 10:12
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

Status: Offline

Post #12
Never had a problem with abs pumps, even from dry.

make sure the nipples and bore are clean and you don't open the nipples too far, as you can draw air down the threads.

if the car has had any brake lines recently check the unions, I've had a Ford fusion in recently which had failed mot for two years running on a long pedal, found a loose inline join on a factory brake line, god knows why it was loose, it was 15 years old and there's no reason to loosen them other than replacing the pipes!!

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Posted 5th Feb 2017 at 10:28
deeturbo

Regular

Location: Leighton Buzzard

Registered: 22 Feb 2003

Posts: 283

Status: Offline

Post #13
Was the Fusion loosing fluid with loose union?

I'm not loosing any fluid.
Posted 5th Feb 2017 at 12:04
armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

Status: Offline

Post #14
If you have excessive squadge and brake pedal travel then can only be a bulging brake hose or air in the system.

If you mean you feel you have to apply more braking effort with your foot to stop than other 6's then perhaps your servo just isn't as strong as others.

The servo on my 6 hardly does a lot compared to others I've owned I've often thought about changing it but tbh if you stamp on the pedal hard enough it still bloody stops.

Put a new servo in my old hdi with 6 brakes on that Aaron6 now owns and literally the lightest tap on the pedal sends you through the windscreen it's that sharp.

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Posted 5th Feb 2017 at 12:19

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