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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 20593
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 2012 Range Rover Sport with 28k miles. When I came

Customer Question

I have a 2012 Range Rover Sport with 28k miles. When I came driving in normal conditions and short runs it is fine. When I would be on a long Journey and braking a lot, the brake pedal seems to get hard and if I was braking coming up to a junction it is as though the car is holding back as if it is affecting the transmission. Any ideas
Submitted: 4 months ago.
Category: Car
Expert:  Matt replied 4 months ago.

Hello

this sounds like you may be losing vacuum to the brake servo

now depending on the engine spec it may use a vacuum pump driven off the back of the cylinder head to drive the serov - in which ase check the condition of the hoses between servo and engine 1st and if OK then get a vacuum gauge onto the pump to ensure is generating at least 0.5bar of vacuumn with the engine idling

if its the later system where the inlet manifold has a throttle then check for hose leaks too

Expert:  Matt replied 4 months ago.

Hi

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