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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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Random brake pedal travel issueViews : 1581 Replies : 38Users Viewing This Thread : |
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Sep 5th, 2021, 15:35 | #1 |
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Random brake pedal travel issue
I have an issue with my 1999 V70 T5. I estimate that about one in every twenty times I press the brake pedal, it travels down almost to the floor. It can be quite a shock when it happens.
I have replaced my brake pedal position sensor, hoping that would fix it (I used Vida Dice - it said that it was faulty), but it still happens occasionally. Any suggestions please as to what the cause of this issue is, and any solutions? Cheers,
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2007 S80 D5 SE Sport Geartronic 1999 V70 T5 SE Auto |
Sep 5th, 2021, 16:19 | #2 |
MaDMaN
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master cylinder
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Sep 5th, 2021, 21:22 | #3 |
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Master cylinder.
If there is no fluid loss, it will most likely be an internal leak in the master cylinder. If you press firmly on the brake pedal it most likely feels normal. Try resting your foot very lightly on the brake pedal hardly pressing it at all with little more force than needed to overcome the return spring. If the pedal slowly sinks to the floor, it's virtually conclusive there's an internal leak. Martin |
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Sep 6th, 2021, 14:33 | #4 | |
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I'll report it to my local independent mechanic and see what he says. Any thoughts from your experience on what they normally do to fix it? The V70's probably not worth a lot of money, so I hope he doesn't say he needs to replace the entire master cylinder. Cheers for your help.
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2007 S80 D5 SE Sport Geartronic 1999 V70 T5 SE Auto |
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Sep 6th, 2021, 16:30 | #5 |
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No problems.....
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Sep 6th, 2021, 21:39 | #6 |
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The surest and probably safest option is to replace the master cylinder.
However replacement seal kits are available but these will only be successful if the cylinder bore is undamaged. If there's any scoring then new seals will have a short life. If you are paying to have the job done then the work involved in removing and replacing the master cylinder is the same whether you are fitting a new one or putting the old one back after overhaul. Although the seal kits are relatively cheap, your mechanic's time spent overhauling the old cylinder may not be. Unfortunately he or she won't know if it can be repaired until the old cylinder has been dismantled. This cost could go a considerable way towards the price of a new cylinder A few things to bear in mind. Your car is an automatic and it could be argued tha you are rather more dependant on the brakes than you may be with a manual transmission. Phase 1 V70s are getting thin on the ground and are beginning to be sought after and a T5 is likely to generate some interest so it may well be worth spending the money for a new cylinder. Not that this helps in the slightest if your budget is tight! I run a 1998 V70 Tdi auto with 228,000 mile on the clock. If it were me I'd bite the bullet and replace the cylinder but I do have considerable affection for the car having owned it for nearly 20 years and I'd be doing the work myself. Hope this is of some help. Do let us know how you get on. Martin |
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Sep 7th, 2021, 20:48 | #7 | |
DPF free.FCUK Greta he he
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Sep 7th, 2021, 21:23 | #8 |
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I've recently replaced my 850 master cylinder with a new ATE one bought from ebay, £116.96 delivered from Latvia. A straight forward swap using a few spanners and a Gunsons eezibleed.
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