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Matt, Mechanical Engineer
Category: BMW
Satisfied Customers: 22756
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Hi, I have a 2003 318 csi convertible, the brake pedal goes

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I have a 2003 318 csi convertible, the brake pedal goes hard intermittently making braking difficult. I have had the servo replaced which initially cured the problem but it has come back and the garage who changed the servo cannot solve the problem. - Any ideas?

I'd suggest also replacing the vacuum hose and its 1 way valve as well

there's a large 1/2" hose that runs to the brake booster from the inlet manifold

I've known these to collaspe internally and create a restriction so preventing any vacum from being generated and there's a 1 way valve in the pipe on some models that can also sieze up, creating the same issue
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