brake problem

[stefmc]

hi,,i have a 2014 2.0 cdti insignia.it went into the garage to get the brake master cylinder changed.when I got it back the pedal is hard to press but the brakes are rubbish,if I have to brake quick its like theres nothing.just a really hard pedal.if I press slowly it brakes better,but still not great,and theres a little hiss noise at the start.any ideas guys,thanks in advance

[bonehead]

take it back.

seems obvious, I know, but probably the best course of action.

why was the master cylinder changed?

[JP777]

Sounds like they haven't set up the vacuum unit correctly.

[stefmc]

Thanks for the input guys..took it back to the garage. .he stripped it down again and a washer had moved between the cylinder and the servo. .so all good now..the service soon message is still coming up when I start it..can I erase ir or does it need to be done in a garage.

[northpole]

i would have that turned off after you've done the service or it should be done at the garage that does the service for you. The reminder is there to let you know it is time for a service not just to annoy you.

[Big Dave]

the service soon message is still coming up when I start it.

If it's the same as my Astra-J, then the SVS message (Service Vehicle Soon) doesn't mean that at all. It means there is a fault and needs putting on a diagnostic reader.

SVS represents what the car/spanner symbol used to mean on the Vectra. Daft I know, but that's Vauxhall for you.

https://www.youtube.com/watch?v=4mAk_khAH04

Chances are, as it's a diesel, it's probably a glowplug failure. It was in the case of mine. Op-Com managed to identify it, although Op-Com thought my Astra was a Vx220 speedster. It correctly identified the engine though.

[northpole]

i didn't know they changed it... just diagnose it first than it might not be a service after all (very confusing though)

[stefmc]

a wee update,,when the master cylinder wasn't fitted properly that's when the service message first came up and the car went into limp mode,,im led to believe its got something to do with the vacuum that's created for the brakes being connected to the engine in some way .so when the vacuum wasn't created it produced the engine fault.anyway,it came on this morning,but the dozen or so times ive started it since then it hasn't,so id say that its fixed,and cars driving and braking great,,fingers crossed it continues,lol,thanks for all your replys

[Big Dave]

anyway,it came on this morning,but the dozen or so times ive started it since then it hasn't

Which suggests there is a still a fault somewhere. It wouldn't have come on otherwise. Put a shout out in your local area to see if anyone local to you can put it on a diagnostic scanner for some beer money.