squirmy brake pedal feel

[///M42 sport]

just the past 2 days I feel vibrations in the brake pedals with just idle. No fade in the brakes. Just feels like the brake pedal is unsteady. Also noticed a weird noise, cant describe it when pressing on the brake pedal...any ideas?

brake booster?

[jlevie]

If you feel vibration in the brake pedal when the engine is idling and the car is not moving, there's a problem with the booster or vacuum line/check valve. An engine that is suffering from intake leaks and has a less then smooth idle will aggravate any issues related to the booster.

[///M42 sport]

thanks, thats kinda what i'm feeling. but smooth idle.

dont really have experience with brake boosters. besides 14, 16, and 17 what other parts should I look into?

http://bmwfans.info/parts/catalog/E30/2-doors/USA/318is-M42/LHD/M/1991/browse/brakes/power_brake_unit_depression/

[jlevie]

The booster itself.

[SeatTime]

Pull a vacuum on the booster and you can diagnose a bad booster diaphragm.

[///M42 sport]

cool thanks.

[///M42 sport]

so the grinding noise got worse, I was driving around town, parked my car, when I got back in found suddenly I couldnt even shift into gear. Had to tow to a buddys shop. Ordered a new clutch, etc...$800 in parts from blunttech. Will update in a few days. Thinking at this point the throwout bearing took a shit.