brake performance - Mercedes-Benz Forum
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post #1 of 11 (permalink) Old 06-15-2019, 02:15 PM Thread Starter
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brake performance

hi. Sometimes it is very hard to stop the car while especially driving downhill and when the car is loaded. I had to fully press brake pedal and force it very hard to stop. brake pads are ok and discs also seems ok. while I was driving my old vw passat pressing brake very gently was enough to stop it completely. do brakes behave like this on your car too?
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post #2 of 11 (permalink) Old 06-15-2019, 02:32 PM
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Sounds like your rotors/disks may be getting over heated. Even if the pads and rotors are smooth, they can be too thin to absorb the heat properly. Another area that can effect brake performance is old contaminated fluid.

Your symptoms would suggest they need some sort of service.
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post #3 of 11 (permalink) Old 06-15-2019, 06:51 PM
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Mine are getting to be the absolute shits too - it's nearly impossible to make the car stop hard enough to activate ABS.

They flash rust in rain and after three days of disuse they're like sandpaper and a 1924 Lea-Francis probably stops better. German discs are atrocious. Never had these issues with a Peugeot 405 in 366,000 km....

I need to buy new rear calipers, new rubber hoses (I expect) and 4 discs and maybe that will sort it out. Will do that around 300K km. Last investment in the car before she's replaced in a few years' time.
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post #4 of 11 (permalink) Old 06-15-2019, 07:25 PM
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Wouldn't hurt to downshift and take some load off the brakes in that situation.
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post #5 of 11 (permalink) Old 06-15-2019, 09:00 PM
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5 speed manual and for me that's normal (double clutch to save linings and synchros) but the problem is the brakes are under used, not over used.
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post #6 of 11 (permalink) Old 06-15-2019, 11:39 PM Thread Starter
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Originally Posted by 260e crusier View Post
Wouldn't hurt to downshift and take some load off the brakes in that situation.
I don't usually downshift cvt, I think hurting brakes seems better idea instead of hurting cvt.
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post #7 of 11 (permalink) Old 06-16-2019, 08:02 AM
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Make sure that all 4 calipers are travelling in and out smoothly... You would have to remove the wheels and manually push the pistons in ( a "C" clamp is a simple way to check this..) and see if they all move in with the same effort.

Remember to protect the pistons from coming out too much if you apply the brakes with the calipers free..



For the calipers again..

If not, you might have corrosion behind the caliper piston and out of sight. One reason why we change the brake fluid on a regular basis..(usually 2 years..for the fluid..)

Let us know if you find anything..
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post #8 of 11 (permalink) Old 06-16-2019, 08:52 AM
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Originally Posted by pablo_can View Post
I don't usually downshift cvt, I think hurting brakes seems better idea instead of hurting cvt.
Every situation is different. OP has some unknown issues with his brakes. Most modern cars should not have any problem slowing down or stopping, even under load and going down hill. It's either mechanical or driver's bad braking technique.

I was merely suggesting other options that a lot of people have forgotten today when driving cars with auto transmissions. Better to downshift or even use emergency brakes to slow car down than losing control.

Last edited by 260e crusier; 06-16-2019 at 08:57 AM.
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post #9 of 11 (permalink) Old 06-16-2019, 01:49 PM
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I would also make sure that the caliper guides are moving in and out freely.... The brake pads should always be free and movable..along with the calipers pistons..

If anything is too tight (possible due to rust..), the brakes will not stop the car properly....



My B stops very well, but I have to keep on top of the floating parts..
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post #10 of 11 (permalink) Old 06-17-2019, 01:02 AM Thread Starter
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when the ac is on, it is getting worse. Are there any relation between ac and brakes?
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