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Old 07-05-18, 10:57 AM   #1
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Default Brake pedal sinks to floor

Hi my brake pedal on 207 sinks to the floor even with engine of when i pump the pedal it does not get hard and just sinks. Theres no fluid leaks anywhere the fluid looks on and not low. Any ideas thought it was master cylinder but surelly when engine of the pedal pumped up should be hard and not sink
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Old 07-05-18, 12:15 PM   #2
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If the pedal sinks to the floor and there is no fluid leak its definitely master cylinder.
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Old 07-05-18, 12:36 PM   #3
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But wouldnt the pedal go hard when the engine is off? I thought it might be the brake servo
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Old 07-05-18, 02:45 PM   #4
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I am no expert on brakes, but if there are no external leaks and the fluid level in the reservoir is still on the MAX level line. Then it must be the master cylinder that is not working.

Some clues to this is the colour of the brake fluid, if it is dark brown, then your brake fluid is contaminated, possibly one of the seals on the master cylinder has rotted.
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Old 07-05-18, 02:46 PM   #5
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But the pedal would go hard when engines of wouldnt it?
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Old 07-05-18, 02:57 PM   #6
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Quote:
Originally Posted by abz123 View Post
But the pedal would go hard when engines of wouldnt it?
I suppose it would if the system didn't have an internal leak.
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Old 07-05-18, 03:54 PM   #7
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Mine sinks even when engine is of so im usure if its master cylinder or servo
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Old 07-05-18, 05:02 PM   #8
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I think all the servo does is increase the braking power, which it can't do if the master cylinder is leaking.
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Old 07-05-18, 05:12 PM   #9
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Is faulty master cylinder common on the 207
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Old 07-05-18, 05:48 PM   #10
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Quote:
Originally Posted by abz123 View Post
Mine sinks even when engine is of so im usure if its master cylinder or servo
Your problem is nothing to do with the servo.
The servo is just a vacuum tank, all it does is increase the pedal pressure on the master cylinder. What is happening is that the piston seals in your master cylinder are failing and brake fluid is getting past,hence the pedal going to the floor. Get a new cylinder fitted pronto before you have brake failure.

The "hard pedal"your talking about is when everything is working properly.You turn the engine off,pump the pedal a few times to empty the servo vacuum tank and the pedal goes hard.That is normal on every car.

Servo`s very rarely fail,but if it did you will have a hard pedal and no brake assistance,so you would need to press the pedal really hard to make the car stop.
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