Brakes problem, lots of parts changed

[jonesg]

yeh an unfamiliar mechanic could easily get the spring wrong.

[jonesg]

I don´t really know... the mechanic had been trying to repair the brakes for more than 1 month, but the brakes are exactly the same so I think I will test the ABS like you Oro told me and then search for another mechanic...

thats not a mechanic, they threw parts at an undiagnosed problem.
go for the easy things, no parts required, Caliper spring, or

an air bubble in the master cyl.
if you don't have the adapters to bench bleed you can try a turkey baster with a section of plastic tube to get to the end of the cyl (furthest end from the firewall).
remove the cap and the strainer basket from the steering fluid reservoir. Bend the tube so it goes to the highest point .
I know a guy who sticks a straw in there and sucks it out with his mouth,
spits it out, he's a fast mechanic, works on caterpiller dozers..

i didn't fancy that so i bought a cheap master cyl bleed kit, you remove the lines, pull the master from the brake booster and set it in a vice, route the lines back into the top of the reservoir so when you pump the piston it just refills itself. see the video.

cheap bleed kit for master cyl.
https://shop.advanceautoparts.com/p/dor ... lsrc=aw.ds

[kontad]

Ok guys, so the front calipers are ok but the rear ones are not ok

I’m really grateful for your help guys, I’m gonna try to put the callipers in the correct position and then let you know if the problem is solved!!

thats not a mechanic, they threw parts at an undiagnosed problem.
go for the easy things, no parts required, Caliper spring, or

an air bubble in the master cyl.
if you don't have the adapters to bench bleed you can try a turkey baster with a section of plastic tube to get to the end of the cyl (furthest end from the firewall).
remove the cap and the strainer basket from the steering fluid reservoir. Bend the tube so it goes to the highest point .
I know a guy who sticks a straw in there and sucks it out with his mouth,
spits it out, he's a fast mechanic, works on caterpiller dozers..

i didn't fancy that so i bought a cheap master cyl bleed kit, you remove the lines, pull the master from the brake booster and set it in a vice, route the lines back into the top of the reservoir so when you pump the piston it just refills itself. see the video.

cheap bleed kit for master cyl.
https://shop.advanceautoparts.com/p/dor ... lsrc=aw.ds

[firstv70volvo]

Ok guys, so the front calipers are ok but the rear ones are not ok

I’m really grateful for your help guys, I’m gonna try to put the callipers in the correct position and then let you know if the problem is solved!!

I don't know if it's possible with your car but I've seen calipers swapped left on right, right on left and the air bleed screws ends up in the lower position because the calipers are mounted on the wrong side and this traps air in the calipers.

[kontad]

Update:

The problem is fixed and my car now brakes ok. How? I don’t really know

In these months I have tryed your tips (I am so thankful for them) but none of the worked and I was so tired of trying that left that problem appart.

Today I changed the battery because it was dead and then drove a couple of km, the car was still having the same braking issues.Then I connected my just arrived Volvo Vida Dice diagnosis. I checked all the faulty diagnostics and some of them were these:

BCM-0057 Power supply Voltage too low
BCM-0103 Pedal position sensor Faulty signal
BCM-0150 Stop (brake) lamp switch Signal outside

I disconnected the Vida Dice and then to my incredible surprise… the brakes were PERFECT

I don’t even know what happened, I did not touch anything in Vida apart from error codes. Now I know that it was an electrical problem but I don’t know if it was because of the battery or the Vida program self recalibrated de BCM module or something..

I am posting this solution in case that someone have this strange problem in the future that had me crying for months

[kontad]

Update:

The problem is fixed and my car now brakes ok. How? I don’t really know

In these months I have tryed your tips (I am so thankful for them) but none of the worked and I was so tired of trying that left that problem appart.

Today I changed the battery because it was dead and then drove a couple of km, the car was still having the same braking issues.Then I connected my just arrived Volvo Vida Dice diagnosis. I checked all the faulty diagnostics and some of them were these:

BCM-0057 Power supply Voltage too low
BCM-0103 Pedal position sensor Faulty signal
BCM-0150 Stop (brake) lamp switch Signal outside

I disconnected the Vida Dice and then to my incredible surprise… the brakes were PERFECT

I don’t even know what happened, I did not touch anything in Vida apart from error codes. Now I know that it was an electrical problem but I don’t know if it was because of the battery or the Vida program self recalibrated de BCM module or something..

I am posting this solution in case that someone have this strange problem in the future that had me crying for months

It seems like I have talked too fast.. I have problems again

I Took the car for a Second test drive and now the car is braking all the time without depressing the brake pedal, it has too the ABS light on sometimes (It never las on before)... I know that the car is constante braking because the car have a Lot less power, Lot more consumption and if I Park the car downhill without the handbrake up, it wont fall. It is maybe because of the BCM-0103 pedal position faulty Signal? I dont know what to do

[jonesg]

drive the car a short distance and roll to a stop without using brakes if possible.
feel the brake disks, one or more will be hot if they are dragging.
if both back brakes are hot the emergency brake cables might be binding.

[kontad]

drive the car a short distance and roll to a stop without using brakes if possible.
feel the brake disks, one or more will be hot if they are dragging.
if both back brakes are hot the emergency brake cables might be binding.

Thanks, will try tomorrow

But I think is more an electric problem because this happened just after my previous soft brake pedal problem dissapeared and now the abs light is on. I will try to recalibrate the brake travel sensor on VIDA too

[firstv70volvo]

Update:

The problem is fixed and my car now brakes ok. How? I don’t really know

In these months I have tryed your tips (I am so thankful for them) but none of the worked and I was so tired of trying that left that problem appart.

Today I changed the battery because it was dead and then drove a couple of km, the car was still having the same braking issues.Then I connected my just arrived Volvo Vida Dice diagnosis. I checked all the faulty diagnostics and some of them were these:

BCM-0057 Power supply Voltage too low
BCM-0103 Pedal position sensor Faulty signal
BCM-0150 Stop (brake) lamp switch Signal outside

I disconnected the Vida Dice and then to my incredible surprise… the brakes were PERFECT

I don’t even know what happened, I did not touch anything in Vida apart from error codes. Now I know that it was an electrical problem but I don’t know if it was because of the battery or the Vida program self recalibrated de BCM module or something..

I am posting this solution in case that someone have this strange problem in the future that had me crying for months

It seems like I have talked too fast.. I have problems again

I Took the car for a Second test drive and now the car is braking all the time without depressing the brake pedal, it has too the ABS light on sometimes (It never las on before)... I know that the car is constante braking because the car have a Lot less power, Lot more consumption and if I Park the car downhill without the handbrake up, it wont fall. It is maybe because of the BCM-0103 pedal position faulty Signal? I dont know what to do

Have you recently changed the master cylinder or brake booster? Or any other work before this problem started?

[kontad]

Have you recently changed the master cylinder or brake booster? Or any other work before this problem started?

I had really soft brakes so changed the master cylinder and the servo, but the car was braking exactly the same. It was when I changed the battery and connected the VIDA diagnosis when my car started braking perfectly and then, 1h after, the car had the brakes “stuck” all the time, so I passed from having little brakes to having to much brakes.

The errors that I have on the Brake Control Module are “faulty signal on brake pedal travel sensor” and “Power supply voltage too low”. I think that the brake pedal travel sensor is bad and so is the abs module, or maybe there is a bad relay that I am not able to find