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Brake issues, tried all the fixes

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

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JKRayl
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Re: Brake issues, tried all the fixes

Post by JKRayl »

Interesting idea!
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vtl
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Re: Brake issues, tried all the fixes

Post by vtl »

Brake booster has a small spring that keeps the booster out of loop until the spring is compressed. First part of pedal's travel is booster not assisting. Volvo folks report that replacing the booster with the one from V50 completely changes how to brakes work in P2, it's more like a stop switch after the conversion.
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BlackBart
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Re: Brake issues, tried all the fixes

Post by BlackBart »

That is interesting about the V50.

OP - did VIDA actually recommend that bleeding order instead of the normal RR LR RF LF ? You want to push the air out of the farthest caliper from the MC and then work progressively closer.
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vtl
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Re: Brake issues, tried all the fixes

Post by vtl »

I think it does not matter. This car has 4 independent brake contours, plus the Motive bleeder keeps the contours under the pressure all the time.
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JKRayl
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Re: Brake issues, tried all the fixes

Post by JKRayl »

Yep, that's the order that my version of Vida says to do them in. Sounded crazy to me but I figured all lines would be pressured it should be fine.
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vtl
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Re: Brake issues, tried all the fixes

Post by vtl »

I found out by trial that a 5 times cheaper vacuum bleeder does the job better than my Motive. I think the sucking gun is Motive too, but few times more simpler and cheaper.

It is important to c-clamp caliper piston to the end while bleeding. Also one time I had to trigger ABS inlet/outlet valves in VIDA while bleeding in order to fight forever squishy brakes that annoyed me for years. That allowed a large air bubble to escape the ABS system and make brakes great again.
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Re: Brake issues, tried all the fixes

Post by shiloh51933 »

cn90 wrote: Mon Nov 25, 2019 7:59 pm Maybe it is bad Master Cylinder...
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Re: Brake issues, tried all the fixes

Post by abscate »

The master cylinders on Volvo’s seem to last forever. We have so few replacements documented here compared to other makes I’m familiar with.
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Re: Brake issues, tried all the fixes

Post by vtl »

abscate wrote: Sun Dec 01, 2019 10:12 am The master cylinders on Volvo’s seem to last forever. We have so few replacements documented here compared to other makes I’m familiar with.
We had one failed in our brand new 2016 XC60 after only 6 months of use. Same ATE, Made in Czech Republic. It worked most of them time, like 9 in 10 brake attempts, but that 10th braking is all what matters, of course. Took us a few months to convince two dealers and one field engineer that there's something going on with the new car. Field guy guessed the master brake cylinder, and that was it.

It was especially pity because of the Volvo's total safety image. Looking at the dropped quality of everything in that car along the way, we decided that would be our last Volvo. Had owned 4 Volvos, still buying parts for 2 of them.
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June
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Re: Brake issues, tried all the fixes

Post by June »

jimmy57 wrote: Mon Nov 25, 2019 9:09 pm I had a 2004 V70R. It had great brakes. If I drove my truck for a while then my V70 felt like it had too much travel. After a bit it seemed great until I drove the truck again. Is your feeling of too much travel based on comparison to another vehicle? What vehicle? To measure travel is tricky. Sitting still you will apply force that would brake the car at a frantic pace as you have no feedback when not moving as to how hard to push pedal. I have stopped the car and then carefully kept my foot still, pulled up park brake and then compared height of pedal to the height of accel pedal as reference. I thought my V70 was going 3 inches for a quick but not panic stop. It was going about 1 1/2 inches. My truck goes about an inch. I think all P2s have more travel and my 2010 XC60 (P3) is much less.
I agree with this above. My 2004 S80 is also a P2 car and has always had plenty of petal travel. The petal travel has always been normal. It does not go near the floor. The power assist tends to be touchy once brakes engage and stop the car quickly. My car had aftermarket pads installed all 4 wheels once out of state where no dealer was near. The brakes were stiff and needed noticeable more effort to stop the car. Though no dust on the wheels until my dealer put the Volvo pads back.

My particular car is equipped with electronic brake assist. The EBS uses petal travel speed to determine a panic stop is in progress to engage assist. Every time I trigger it the car stops so quickly I still panic. There are no aftermarket components in my braking system currently. So I would not worry about it. June
My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
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