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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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850R (96) BrakesViews : 1486 Replies : 9Users Viewing This Thread : |
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May 15th, 2002, 03:04 | #1 |
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850R (96) Brakes
Hi, driving to work today I heard a sort of humming sound from the front of my 96' 850R which lasted for about 2 minutes and the brake pedal went very hard (though it still worked) as though it had no power assist at all. As luck would have it I was 1 block away from my mechanic so I left it out the front. I haven't heard from him yet but I'm curious as to what may be the problem (and more so the likely damage$). I only had the brakes overhauled about 5 months ago.
Regards Luke |
May 16th, 2002, 00:00 | #2 |
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Last Online: Aug 6th, 2014 21:59
Join Date: Jan 1970
Location: Guildford
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RE: 850R (96) Brakes
Did the hum change pitch with speed???
In that case (and considering the pedal feel) it could be a seazed caliper - which is about £150 + labour, as memory serves. Are you in the UK or the US? Regards, Phil :-)
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Phil "Noiseboy" Wright 850 T5R - The Monster Lump of Quickness S60 D5 SE - The Daily Drive www.t5r.org |
May 16th, 2002, 09:43 | #3 |
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Last Online: Apr 24th, 2008 19:02
Join Date: Dec 2000
Location: Leicester
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RE: 850R (96) Brakes
I speak from bitter experience to say that a siezed caliper means two front discs as well as the caliper assembly.
This will be more like £250 than £150 - sorry. |
May 20th, 2002, 22:43 | #4 |
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RE: 850R (96) Brakes
I'm in Australia. My mechanic had it for 3 days and couldn't find a thing. Hasn't happened since. The sound seemed to be a constant pitch, though very dull sound. He said the caliper's are OK.
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May 21st, 2002, 01:00 | #5 |
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RE: 850R (96) Brakes
how about an abs computer? Did the car trip a code for that? Any abs /tracs lights?
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May 21st, 2002, 21:35 | #6 |
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RE: 850R (96) Brakes
>how about an abs computer? Did the car trip a code for that?
>Any abs /tracs lights? The ABS light has been more or less constantly on since I got it a year ago. I was told it is some manufacturing problem with the 850. My mechanic said there were no faults registered on the ABS. |
May 22nd, 2002, 12:38 | #7 |
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RE: 850R (96) Brakes
I wouldn't agree that the 850 has a manufacturing problem with the abs. If the light was on constantly in the uk then it wouldn't pass an mot test. I think you have an abs problem which, if the computer has gone a bit mad could give a firm pedal without much braking effort as the abs tried to release and reapply the brakes hundreds of times. You would also probably hear a noise from the abs as it did this. If no fault codes are stored, try cleaning the sensors on the brakes and make sure all the wiring is intact.
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May 22nd, 2002, 15:17 | #8 |
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RE: 850R (96) Brakes
If it was the ABS wouldn't you get the banging noise, and the banging on the brake peddle as the ABS did it's thing?
Stu |
May 23rd, 2002, 11:44 | #9 |
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RE: 850R (96) Brakes
You don't have to get the banging noise, it depends how confused it is, and since his abs light is on anyway it would be a good place to start.
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Jun 7th, 2002, 21:55 | #10 |
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Last Online: Jun 11th, 2024 16:54
Join Date: Dec 2001
Location: Stockport, Gtr Manchester
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RE: 850R (96) Brakes
Ok, I am a trespasser on the 850 site and this is a longshot but here goes...
I used to have a 760 and one day it started buzzing as I pulled away after starting, then the buzz would stop and the ABS light would come on. Upon careful investigation I discovered that a front wheel ABS sensor cable had been half cut through by rubbing against the wheel rim. The cable was shorting which sent the ABS control unit into spasm (buzzing the ABS pump) before shutting itself down when it realised that something was wrong. Summary: test the ABS sensors.
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Mike Arnold. 1966 122S |
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