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displaying posts 1 to 21 of 21
| Author | Subject: Soft brake pedal even after loads of bleeding |
 demondriverdan
Seasoned Pro  Location: Londinium Registered: 29 Nov 2010 Posts: 2,665 Status: Offline |
Post #1
Not sure what to do on this one. I replaced the brake lines in a car with copper and the brake pedal has never been very good. I've bled all 4 brakes a few times (putting nearly 2l of extra fluid through the car) and even tried replacing the MC but it still isn't great. I want the pedal to feel harder, like you can really push it as you can in my race car.Any ideas? Bit stumped on this one ________________________________________ Rallye Race Car |
 Posted 11th Sep 2016 at 15:59
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #2
has it got a load compensator?________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 11th Sep 2016 at 18:19
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demondriverdan
Seasoned Pro Location: Londinium Registered: 29 Nov 2010 Posts: 2,665 Status: Offline |
Post #3
No, only bias valve________________________________________ Rallye Race Car |
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Posted 11th Sep 2016 at 18:19
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aaron6
Seasoned Pro  Location: On the sofa in maidstone Registered: 16 May 2006 Posts: 5,840 Status: Offline |
Post #4
What fluid you using as i got a similar kit to yours and my pedals is spot on.________________________________________ See the sheer power and might of the lesser known burrowing owl. |
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Posted 11th Sep 2016 at 21:04
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demondriverdan
Seasoned Pro Location: Londinium Registered: 29 Nov 2010 Posts: 2,665 Status: Offline |
Post #5
This is a standard setup, it's not on my car. Mine is absolutely fine  ________________________________________ Rallye Race Car |
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Posted 11th Sep 2016 at 21:36
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tvrfan007
Seasoned Pro  Location: In the garage Registered: 29 May 2005 Posts: 3,488 Status: Offline |
Post #6
If the car has abs I would suggest air is trapped somewhere. You can try and take it to a loose surface car park and cycle it a few times, drive about a bit, bleed again. ________________________________________ I'm Si btw Night Blue VW Golf GTD Bianca LBSC Rallye - Track/Road Slag Project Thread Sparkling Silver Mini Cooper D - Super Dooper  - (The other half's wheels) |
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Posted 11th Sep 2016 at 21:53
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demondriverdan
Seasoned Pro Location: Londinium Registered: 29 Nov 2010 Posts: 2,665 Status: Offline |
Post #7
No ABS, new copper piping throughout________________________________________ Rallye Race Car |
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Posted 11th Sep 2016 at 22:05
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Ben_W
Formerly gpm  Location: Lutterworth Registered: 01 Sep 2007 Posts: 2,941 Status: Offline |
Post #8
There's either air still in it or its leaking somewhere......just out of interest, how old was the fluid you put in? ________________________________________ Cherry Red Rallye .... On going OEM spec restoChina Blue GTi6 .... Weekend toy Black 208 GTi .... Wife's car now Silver BMW 550i.... The executive missile |
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Posted 11th Sep 2016 at 22:15
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demondriverdan
Seasoned Pro Location: Londinium Registered: 29 Nov 2010 Posts: 2,665 Status: Offline |
Post #9
Brand new, no point putting old fluid in a car! I'm going to drain it all and try a different fluid, see if that sorts it. There are no leaks as far as I can tell. All very frustrating!________________________________________ Rallye Race Car |
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Posted 11th Sep 2016 at 22:25
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adam b
Seasoned Pro  Location: The Nam Registered: 24 Jan 2006 Posts: 12,828 Status: Offline |
Post #10
What calipers are on it? Are you pressure bleeding or using the pedal? ________________________________________ Nothing to see here |
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Posted 12th Sep 2016 at 07:03
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demondriverdan
Seasoned Pro Location: Londinium Registered: 29 Nov 2010 Posts: 2,665 Status: Offline |
Post #11
Standard all round. Tried both methods, still no luck________________________________________ Rallye Race Car |
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Posted 12th Sep 2016 at 07:05
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adam b
Seasoned Pro Location: The Nam Registered: 24 Jan 2006 Posts: 12,828 Status: Offline |
Post #12
I would check all the connections are good, nip them up. Check the rubber hoses are good and aren't bulging. Check no leaks from calipers. Bias valve the right way round? I'd use it, get the brakes hot and cold a few times. Bleed using the pedal. Might just need cycling through ________________________________________ Nothing to see here |
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Posted 12th Sep 2016 at 08:36
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demondriverdan
Seasoned Pro Location: Londinium Registered: 29 Nov 2010 Posts: 2,665 Status: Offline |
Post #13
Cheers Adam, will do all that ________________________________________ Rallye Race Car |
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Posted 12th Sep 2016 at 09:06
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armzsc6
Seasoned Pro  Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #14
I usually get bleeding spot on but after upgrading the rear brakes on my leon to larger vented cupra r setup there was clearly air still in the system. Wouldn't Bleed out no matter what. Drove it about a couple of days with shocking pedal then bled again amd loads of air came out the rear lines. Rock hard pedal again. ________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 23rd Sep 2016 at 08:16
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jord294
Seasoned Pro  Location: somewhere in north wales Registered: 09 Nov 2009 Posts: 3,102 Status: Offline |
Post #15
My opinion is new brake fluid has perished seals in M/c slightly.Had this experience on 2 previous cars. If doing new brakelines, I tend to use pipe with kunifer, as copper is too soft ________________________________________ FRESHLY RE-FURBISHED GTI BEAMSFITTING AND LOWERING AVAILABLE. ALL AXLES BUILT USING GENUINE PEUGEOT PARTS IF I'M NOT HERE, IT ONLY MEANS ONE THING.... I'M SOMEWHERE ELSE! |
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Posted 23rd Sep 2016 at 17:50
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #16
new fluid wont do that, the rubber is brake fluid resistant, its just worn out.________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 23rd Sep 2016 at 17:54
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jord294
Seasoned Pro Location: somewhere in north wales Registered: 09 Nov 2009 Posts: 3,102 Status: Offline |
Post #17
I beg to differ mei________________________________________ FRESHLY RE-FURBISHED GTI BEAMSFITTING AND LOWERING AVAILABLE. ALL AXLES BUILT USING GENUINE PEUGEOT PARTS IF I'M NOT HERE, IT ONLY MEANS ONE THING.... I'M SOMEWHERE ELSE! |
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Posted 23rd Sep 2016 at 19:10
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mocinim
Seasoned Pro  Location: The Darkside of bedford :) Registered: 09 Jan 2015 Posts: 2,307 Status: Offline |
Post #18
Would imagine its both the rubber composition is altered due to age wear n contamination and the new fluid has attacked it being neet and corrosive ?? ________________________________________ BLACK RALLYE - phoenixWHITE RALLYE - valliant http://public.servicebox.peugeot.com/ https://www.gov.uk/check-mot-history |
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Posted 23rd Sep 2016 at 20:52
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pete_rallye
Seasoned Pro  Location: Yorkshire Registered: 12 Dec 2002 Posts: 5,253 Status: Offline |
Post #19
Its a new master cylinder though isn't it? The rubber shouldn't perish that quickly. You still got the servo? If the servo is f**ked you never get the full vacuum effect which can cause pedal to feel soft even though it isn't. There isn't an 'up and over' bit in the pipe anywhere that could trap air is there? Is it a standard master cylinder? If you completely empty a master cylinder they can be a b**ch to get the air out of. My old Volvo V70 did this so one day I sat there and just pumped the brake pedal about 50 times and the pedal slowly came back again. ________________________________________ Oulton Park in a BTCC 306 vid 1Oulton Park in a BTCC 306 vid 2 Lap of the 'ring |
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Posted 23rd Sep 2016 at 21:38
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mocinim
Seasoned Pro Location: The Darkside of bedford :) Registered: 09 Jan 2015 Posts: 2,307 Status: Offline |
Post #20
Its bad design really my old vw bora had a bleed valve on the pump block saved so much grief ________________________________________ BLACK RALLYE - phoenixWHITE RALLYE - valliant http://public.servicebox.peugeot.com/ https://www.gov.uk/check-mot-history |
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Posted 23rd Sep 2016 at 21:43
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armzsc6
Seasoned Pro Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #21
Get anywhere with this?________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 12th Oct 2016 at 23:00
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