HELP NEEDED! M5 brake retrofit problem
12-06-2010, 07:16 PM
#31
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1- they will install stock rotors and calipers (to make sure car is braking fine)
2- they will replace ONE stock rotor and caliper for an M5's, if the car brakes fine, they will replace another caliper and rotor and make sure car STILL brakes fine, and so on until they find the defective caliper(s).
Does this makes sense?
12-07-2010, 10:06 AM
#32
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I hope the shop has been keeping the reservoir full of brake fluid while all this bleeding has been done and every time the lines are opened the car must be bled. any pics of whats going on too would help
12-07-2010, 11:26 AM
#33
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My Ride: BMW E60 with 1M front bumper,20"AC Schnitzer wheeels,M5 front and rear brakes,M5 rear bumper with quad exhausts H&R Anti roll bars, Fully adjustable coilovers, re-mapped,Fully enclosed AFE cold air intake filter,Full Lci black grained leather trim
Model Year: 2004
Engine: 3.0i
I too have fitted the M5 brakes, front and rear,to a 2004 530i Sport and mine work fine without any other mods.
12-07-2010, 01:58 PM
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My Ride: 530I Silver gray with gray leather with Premium Package, Logic 7 Premium sound system with Ipod interface, xenon adaptive headlights, Active steering, Power retractable rear sunshade, Comfort seats, Cold weather package and M5 OEM 166 wheels, Sprintbooster. Ceramic Tint all around, Bilstein Sports shocks with Eibach springs, Brake performance Rotors and Axxis ceramic pads.
Shop will run a final test tomorrow;
1- they will install stock rotors and calipers (to make sure car is braking fine)
2- they will replace ONE stock rotor and caliper for an M5's, if the car brakes fine, they will replace another caliper and rotor and make sure car STILL brakes fine, and so on until they find the defective caliper(s).
Does this makes sense?
1- they will install stock rotors and calipers (to make sure car is braking fine)
2- they will replace ONE stock rotor and caliper for an M5's, if the car brakes fine, they will replace another caliper and rotor and make sure car STILL brakes fine, and so on until they find the defective caliper(s).
Does this makes sense?
12-08-2010, 01:31 PM
#36
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12-08-2010, 01:47 PM
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My Ride: '05 545i SMG, 35% Tint, LED Angel Eyes
12-08-2010, 01:49 PM
#38
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Still doesn't make sense. Memeber 525iEnjoy has done this without issues without such issues. This still sounds like there is air in the system. Is your shop BMW qualitfied? There's one more method of bleeding the brakes using the GT1 computer. There's what's called a DSC flush. My indy guy did this for me a while back where your car will be hooked up to the computer and the DSC unit will circulate as each corner of the brakes are bled. The process fills the DSC unit will fluid to make sure there is no air in the system.
We did the test by changing one M5 rotor and caliper at the time, special care and attention was given to the bleeding and the reservoir.
Results of the test:
- Everytime they installed an M5 rotor/caliper, I could feel the car breaking softer.
So, everytime we did the test and we felt the car braking softer, we changed back to all stock and test it again, car braking was good when all stock.
We changed all 4 M5 calipers and rotors individually, and every time we had one M5 installed, the braking was crap.
NOTE: The time we had 2 M5 calipers and rotors installed, the car didn't brake for shit!
My mechanic is Bmw certified and he tells me he doesn't see anything defective about any of the calipers, his logic tells him that the BRAKE MASTER CYLINDER might be damaged of underperforming, that I should consider replacing with the M5 BRAKE MASTER CYLINDER, that be default, braking should be good.
What do you guys think?
M5 calipers are fine.
No air in the lines.
No leaks anywhere.
Please help me
12-08-2010, 02:24 PM
#39
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My Ride: 530I Silver gray with gray leather with Premium Package, Logic 7 Premium sound system with Ipod interface, xenon adaptive headlights, Active steering, Power retractable rear sunshade, Comfort seats, Cold weather package and M5 OEM 166 wheels, Sprintbooster. Ceramic Tint all around, Bilstein Sports shocks with Eibach springs, Brake performance Rotors and Axxis ceramic pads.
We ran the test, put all 4 stock calipers, we made sure my car was braking fine, and it was.
We did the test by changing one M5 rotor and caliper at the time, special care and attention was given to the bleeding and the reservoir.
Results of the test:
- Everytime they installed an M5 rotor/caliper, I could feel the car breaking softer.
So, everytime we did the test and we felt the car braking softer, we changed back to all stock and test it again, car braking was good when all stock.
We changed all 4 M5 calipers and rotors individually, and every time we had one M5 installed, the braking was crap.
NOTE: The time we had 2 M5 calipers and rotors installed, the car didn't brake for shit!
My mechanic is Bmw certified and he tells me he doesn't see anything defective about any of the calipers, his logic tells him that the BRAKE MASTER CYLINDER might be damaged of underperforming, that I should consider replacing with the M5 BRAKE MASTER CYLINDER, that be default, braking should be good.
What do you guys think?
M5 calipers are fine.
No air in the lines.
No leaks anywhere.
Please help me
Wow, that is a real puzzle. If the brake master cylinder is defective, even with the OEM rotors it would still be soft. GL
We did the test by changing one M5 rotor and caliper at the time, special care and attention was given to the bleeding and the reservoir.
Results of the test:
- Everytime they installed an M5 rotor/caliper, I could feel the car breaking softer.
So, everytime we did the test and we felt the car braking softer, we changed back to all stock and test it again, car braking was good when all stock.
We changed all 4 M5 calipers and rotors individually, and every time we had one M5 installed, the braking was crap.
NOTE: The time we had 2 M5 calipers and rotors installed, the car didn't brake for shit!
My mechanic is Bmw certified and he tells me he doesn't see anything defective about any of the calipers, his logic tells him that the BRAKE MASTER CYLINDER might be damaged of underperforming, that I should consider replacing with the M5 BRAKE MASTER CYLINDER, that be default, braking should be good.
What do you guys think?
M5 calipers are fine.
No air in the lines.
No leaks anywhere.
Please help me
Wow, that is a real puzzle. If the brake master cylinder is defective, even with the OEM rotors it would still be soft. GL
12-08-2010, 06:56 PM
#40
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What are you using for the brake pads? New? Used?
since it seems that your brakes are not working for you I'll give you $200 for you m5 brake system
since it seems that your brakes are not working for you I'll give you $200 for you m5 brake system