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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Brake pressureViews : 766 Replies : 7Users Viewing This Thread : |
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Jun 1st, 2022, 10:21 | #1 |
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Brake pressure
Hi guys, I recently picked up a V70 TDI (D5252t)it runs quite well apart from the brakes, it feels like there is very little pressure in the pedal, although they do stop it’s not a snatchy as my old V70, I’ve read about and it may be the vacuum pump which looks like a huge pain in the bum to remove, is there any way it can be serviced/checked on the car?
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Current Volvo 850 2.5 10V SE 1996 Volvo V70 2.5D 2000 Departed Volvo 850 T5 Turbo 'L94" 1994 Volvo 740 GLE 1990 Last edited by lightyears; Jun 1st, 2022 at 10:32. |
Jun 1st, 2022, 17:15 | #2 |
Grumpy Old Git
Last Online: Apr 19th, 2024 09:16
Join Date: Dec 2004
Location: South Yorkshire
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Its been a while since I had a diesel car, but IIRC, if the vacuum pump isn't working correctly the brake pedal gets very hard to push down? The vacuum pump gives the brake pedal assistance, so if the brake pedal can be depressed 'normally' then I'd assume it is ok.
It may simply be that you need to bleed the brakes (and ideally replace the brake fluid)
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S40 2.4i '07 Japanese import '96 850R - https://www.volvoforums.org.uk/showthread.php?t=312484 Ex Danish Embassy '96 940 GLE LPT - https://www.volvoforums.org.uk/showthread.php?t=326071 |
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Jun 1st, 2022, 17:42 | #3 |
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When was the fluid last changed and bled?!!
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Jun 1st, 2022, 18:31 | #4 | |
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Quote:
Thank you both
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Current Volvo 850 2.5 10V SE 1996 Volvo V70 2.5D 2000 Departed Volvo 850 T5 Turbo 'L94" 1994 Volvo 740 GLE 1990 |
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Jun 1st, 2022, 21:34 | #5 |
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Can we assume you've checked all of the basics like condition of the pads and discs, all of the calipers working fully and slide pins moving freely etc ? I've had a V70 can get an MOT with OK brakes but new pads made a massive difference.
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David V70 2.5 10v Torslanda Manual 98 Sreg |
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Jun 1st, 2022, 21:57 | #6 |
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You can assume correctly, had each wheel off this afternoon, other than being dirty they appear to be functional. However, the brake fluid is very very dark and kind of gloopy so I think I may have found the culprit, will bleed out the fluid and get some new stuff in.
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Current Volvo 850 2.5 10V SE 1996 Volvo V70 2.5D 2000 Departed Volvo 850 T5 Turbo 'L94" 1994 Volvo 740 GLE 1990 |
Jun 1st, 2022, 22:46 | #7 |
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Sounds like a fluid change is long overdue. I'd suggest using a pressure bleeder rather than the traditional method of bleeding by pumping the brake pedal.
With the pressure bleeder there's no risk of taking the master cylinder seals beyond their normal travel and risking damaging them on anything nasty that may be lurking there. With regard to the vacuum pump, yes it is awkward to get at one of the nuts holding it in place but not impossible. Some people use modified spanners or a piece of wire tied to a normal spanner. The vacuum pumps rarely fail but they can get noisy with a distinctive clatter at idle. Martin 1998 V70 Tdi Auto |
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Jun 10th, 2022, 23:09 | #8 | |
Classic P80 1999 BiFuel
Last Online: Mar 6th, 2024 00:34
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Quote:
As the man says, this is a job for a pressure bleeder.
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Bifuel V70 Classic 1999 [The Old Grumpy in the Corner, "When I was a lad... blah, bl**dy blah."] Last edited by CNGBiFuel; Jun 10th, 2022 at 23:23. |
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