when i brake my car revs up

[merclondon]

hi ive got a C2OO Kompressor the red top enigne. when i drive and im doin bout 40-50mph when i touch the brakes to slow down the car revs up to accelerate but then revs go down to normal again and sometimes even at low speeds when im coming to a stand still my car revs up to accelerate. ive took it to a few garages but nothing comes up on the diagnostics machines and i havent got a clue what the problem is. please help. Thank you

 

[Ultymate]

I'd be looking for air/vacuum leaks on your brake servo or it's associated pipework.

 

[television]

The vacuum pipe from the inlet to the servo has a one way valve in it,,its worth checking that,,you can do so by sucking and blowing

 

[Number_Cruncher]

It can't be the one way valve, but, it could be a servo fault. (Either a punctured diaphragm or, a faulty inter-chamber valve not fully closing)

Temporarily blocking the vacuum pipe to the servo would enable this possibility to be investigated in the workshop. With the servo blocked off, I wouldn't take the car on the road.

 

[tasmulz]

hi ive got a C2OO Kompressor the red top enigne. when i drive and im doin bout 40-50mph when i touch the brakes to slow down the car revs up to accelerate but then revs go down to normal again and sometimes even at low speeds when im coming to a stand still my car revs up to accelerate. ive took it to a few garages but nothing comes up on the diagnostics machines and i havent got a clue what the problem is. please help. Thank you

HI i am having the same problem with my C200 Kompressor. did you manage to figure out what was the problem?

 

[LostKiwi]

Thats a good thread resurrection! The last post was over 7 years ago!!!

Sounds to me like a faulty brake servo.

 

[Srdl]

HI i am having the same problem with my C200 Kompressor. did you manage to figure out what was the problem?

Two totally off the wall non mechanical ideas:
1 - the brake pedal is moving the carpet mat slightly which is catching on the accelerator pedal
2 - I have the same problem occasionally when driving my wife's Mini Cooper - one of my big feet on the brake pedal sometimes touches the accelerator pedal at the same time

As I said, totally off the wall ideas......

 

[tasmulz]

Thats a good thread resurrection! The last post was over 7 years ago!!!
Sounds to me like a faulty brake servo.

HIGH REV WHEN BRAKING SOLVED!!!

Thank you for the reply. after two weeks of research, I have learnt that such a problem can be a result of various issues such as vacuum leak, brake servo like you mentioned. GUESS WHAT? yesterday i then recalled how and when the problem started. It started when i put a small size tyre on the driver side (front) (185/60/15) instead of 195/65/15. I suppose this had an effect on traction, hence the car was not balanced and to some extent this affected the braking system. I then went to the garage yesterday and put the right tyre size. NOW THE PROBLEM IS SOLVED, THE CAR CAN NOW BRAKE WITHOUT REVING!!!!... To my collegues out there who might be having this problem especially with a kompressor c200, I suggest they make sure they are using tryes of the same size. HOPE THIS WILL HELP. IT WORKED ON MY CAR

 

[John Laidlaw]

^ thank you tasmulz, hopefully this will help some people- just for my understanding the way you have written this....are you saying that your front axle had a 185/60/15 on the drivers side and a 195/65/15 on the other(passenger) side??

 

[DREAMER NO2]

Thats a new one on me .

 

[John Laidlaw]

Thats a new one on me .

I'm never too surprised but....

 

[flowrider]

^ thank you tasmulz, hopefully this will help some people- just for my understanding the way you have written this....are you saying that your front axle had a 185/60/15 on the drivers side and a 195/65/15 on the other(passenger) side??

Surely no ones that daft!

 

[John Laidlaw]

You reckon?

Surely no ones that daft!

 

[LostKiwi]

Thats a HUGE difference in wheel diameter - 185/60 is over 30mm smaller than 195/65!!!

I'm amazed you didn't notice it in the steering, braking (pulling to one side) or ESP issues.

 

[John Laidlaw]

Thats a HUGE difference in wheel diameter - 185/60 is over 30mm smaller than 195/65!!!

I'm amazed you didn't notice it in the steering, braking (pulling to one side) or ESP issues.

Or spin it on a greasy surface Alastair!

 

[LostKiwi]

Or spin it on a greasy surface Alastair!

ESP would kick in well before that! (as long as it functioned at all!)

 

[John Laidlaw]

ESP would kick in well before that! (as long as it functioned at all!)

Clearly I've not tried that set up ( who would?), but with that difference I'd be surprised if the ESP didn't give up the ghost

 

[LostKiwi]

Clearly I've not tried that set up ( who would?), but with that difference I'd be surprised if the ESP didn't give up the ghost

I would have thought it would kick in all the time to to resolve the imbalance and the only way to drive it would be to turn it off.

 

[tasmulz]

^ thank you tasmulz, hopefully this will help some people- just for my understanding the way you have written this....are you saying that your front axle had a 185/60/15 on the drivers side and a 195/65/15 on the other(passenger) side??

Yes.

 

[John Laidlaw]

Up there with some of the craziest things I've ever heard......