Home > Puma (Tdci) > Brake issue |
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blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17448 |
If it is a 2.4 (which from your description I suspect it is) the vac pump is fed from the engine lubrication system and has feed and return passages through the mounting surface. The only reason why it would not be getting the oil feed would be if the gasket has been fitted incorrectly or if an oil passage is blocked.
The hard pedal fault you describe suggests that the pump is not creating vacuum fast enough and does suggest either that the pump was faulty or possibly there was a leak in the vacuum pipe after you refitted it. There should be no brake fluid anywhere near the vac pump, only engine oil, and as noted above it is fed form the engine's pressurised lubrication system and needs no bleeding. |
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13th Nov 2021 11:03pm |
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MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 625 |
Check for vacuum leakage. I had to replace brake servo on two cars, because it had broken outer steel body and was loosing vacuum. It was only slow leak, first breaking was normal, but repeating breaking leaded to hard pedal. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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14th Nov 2021 6:25am |
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Silver110 Member Since: 10 Jun 2020 Location: East Sussex Posts: 49 |
Thanks for the info,
I believe it’s something to do with oil to the pump as the brakes were fine it’s only if you use them in quick concession as if you were doing a 5 point turn for example. The other tell tale is that it is ticking quite loudly. If I was to take the pump off and start the engine I’m assuming there will be a ton of oil pour out one of the holes? Trying to think of a way to test it. |
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14th Nov 2021 9:10am |
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Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3424 |
Ensure that the vacuum pipe between the pump and the servo is not collapsing, restricting the air flow rate. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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14th Nov 2021 10:57am |
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landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5729 |
Have you checked the servo is empty, and not full of oil? You can use a cable tie as a dipstick.
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14th Nov 2021 11:29am |
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Silver110 Member Since: 10 Jun 2020 Location: East Sussex Posts: 49 |
Sounds interesting how would I do this? Where would I dip it?
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14th Nov 2021 2:39pm |
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Silver110 Member Since: 10 Jun 2020 Location: East Sussex Posts: 49 |
This is next on my list! |
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14th Nov 2021 2:39pm |
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Race.it Member Since: 27 Aug 2019 Location: Algeciras Posts: 823 |
Take off the vacuum pipe on the servo and use that hole? Searching for my first Defender...and started just as Covid hit, so talk about timing. 5 months after starting the search I found it, and here is the details |
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14th Nov 2021 5:05pm |
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Silver110 Member Since: 10 Jun 2020 Location: East Sussex Posts: 49 |
Servo is empty of liquid and can’t see any issue with the vac pipe. Took it off the servo and put the vac onto my finger and had suction.
I’ve also recently installed the LOF power spec discs and pads But don’t see that being an issue. Have searched through hole car whilst on ramp and can’t seen any leaks. |
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21st Nov 2021 7:09pm |
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Silver110 Member Since: 10 Jun 2020 Location: East Sussex Posts: 49 |
Does anyone know anything about bleeding the ABS system? Thinking it may be linked to that.
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23rd Nov 2021 6:49pm |
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Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4216 |
There’s a procedure in the workshop manual for power bleeding the pump and brakes. You need a diagnostic tool that can actuate the ABS pump. I did it last year after removing and refitting the pump. I pressure bled the brakes conventionally before following the manual to power bleed. To be honest, I couldn’t get any more air out power bleeding, so I think it can be done the old fashioned way. 2007 110 TDCi Station Wagon XS
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23rd Nov 2021 7:15pm |
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Silver110 Member Since: 10 Jun 2020 Location: East Sussex Posts: 49 |
Thank you.
Back to the drawing board, frustrating. |
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24th Nov 2021 9:02pm |
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