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21st June 2017, 17:42
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Avid contributor
MG ZT-T, R75 1.8T Tourer,R75 2,5 V6 Join Date: Sep 2016
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Hard Brake Pedal
My brake pedal is very hard but brakes are good.
Any advise on the concerning the pedal? Thanks 
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22nd June 2017, 12:15
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#2 | |
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This is my second home
No more Rover Join Date: Apr 2009
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Quote:
Ken. |
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22nd June 2017, 12:21
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#3 |
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This is my second home
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A hard brake pedal is usually indicative of a lack of or low vacuum in the booster. Don't know how that would tie in with the brakes seeming ok though.
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23rd June 2017, 15:25
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#4 | |
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Avid contributor
MG ZT-T, R75 1.8T Tourer,R75 2,5 V6 Join Date: Sep 2016
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Quote:
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This vehicle was the 6,701st ZT-T to run off the production line, out of 8,249 This vehicle was the 82nd ZT-T 160 (1.8T) to be made out of 118 This vehicle was the 1,309th ZT-T in XPower Grey (code: LEF) to be made out of 1,673 XPower Grey ZT-Ts |
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23rd June 2017, 15:38
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This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
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Hello Seb,
The brake servo is connected to the inlet manifold from where it's evacuated. The servo can then provide the powered brake assistance. You have probably got an air leak in either the servo unit itself or in the pipework to the manifold. There's a check valve in the pipe which might have stuck. I'd strongly suggest not driving the car without full servo assistance to the brakes. You'll not stop it properly without. I'd also recommend getting a Haynes manual or the RAVE manual CD which cover all these issues. TC |
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23rd June 2017, 16:13
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Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Quote:
As you say that the brakes are good, but the pedal just feels hard, it could be that your brake fluid has absorbed moisture and needs replacing. Simon
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24th June 2017, 09:56
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#7 | |
MG ZT Join Date: Jan 2011
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Quote:
 TC has the advice I'd be inclined to follow here, I'd say a vacuum leak to the servo is the most likely scenario. Brake fluid that has absorbed moisture, is more likely to result in a sinking pedal following heavy braking when the fluid "boils" withing the pipework The OP may wish to check the non return valve in the pipework of the breather on the inlet manifold is working correctly, as positive pressure from the turbocharger will diminish the vacuum somewhat Brian  Last edited by marinabrian; 24th June 2017 at 09:59.. |
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Linear Mode
