R33 Brakes ?

[cmitc91]

Hi Guys,

i have a R33 skyline rb25DET Manual coupe

Just had a question regarding my brakes. is a little bit of a noob question aha

basically i will be driving along and just say i slightly put my foot on the brake to slow down coming up to a set of traffic lights if i down shift a gear to slow down as well while my foot is still on the brake the pedal depresses down further. They seem to be a little spongy and not as touchy as they used to be. I have noticed that if you are just idling and press the brake pedal repeatedly a couple of times it takes a couple of pushes till you cant push anymore also the revs go up and down slightly while you do this .

What do you think it is ?

Brakes just need a good bleed ?

Master cylinder gone ??

or brake booster ??

Thanks

[mad082]

it would be to do with the brake booster as it has a vaccum feed from the engine. the higher the vaccum, the more power it has.

as for pumping the brakes, pretty sure that's normal as you are just pumping up the pressure in the system. and i have a feeling that the brakes in my commodore do a similar thing as yours do when pushing the clutch in, etc, when the vaccum changes (such as turning on the aircon, etc, since it's an auto)