Anybody? ^^^

 

I hate to admit this but you never know. I put slotted and cross drilled rotors on my 04 g35 coupe and replaced both rear calipers. After installed I bled and test drove, no pedal. Had to pump my brakes up. Took it back home, removed the rear wheels and bled again. Same thing. I was getting aggravated then it got me. Calipers were on the wrong side. Bleeder was on bottom instead of top. Switched them and viola, back to normal. Just goes to show just because you've done a brake job several times doesn't mean you don't make a mistake. So check your calipers, you never know lol. I'm a noob

 

Havn't seen this mentioned yet, so I wanted to point it out:

A few months ago I replaced a few hoses with silicon versions and wound up with an interesting problem, the first almost full press didn't do much of anything but a second pump would have the brakes nice and firm. Additional immediate presses would find a firm peddle, but waiting for several seconds and it would be soft again. All this with no significant vehicle movement.

Turns out one of the hoses I replaced had a one way vacuum valve in it and the brake booster was losing pressure (or something equivlant.) Replacing the hose with an OEM version put the system back to where it was originally.

No clue if this is the problem that anyone is describing (maybe a crack in the 1-way valve?) The problem was large enough that downhill braking always required 2 pumps.





Thumbs didnt work as expected; here are direct links:
http://www.imagebam.com/image/0e0c85255584872
http://www.imagebam.com/image/24029a255584879

 

Forgot if i updated but my issue was the rear caliper slide pins seizing in place.

Since i own 3 cars, there are times my infiniti sits for a week or two. Last stint was 1 full month of sitting. Well in that time, the rear calipers must of rusted up because as i began to drive it again, the brake pedal became softer and required a double pump.

Checked the rear calipers and sure as hell, one is seized up and won't self-center. I freed up the pins, relubed the caliper and all is good.

This happened twice so far

 

Wouldn't the brake booster loosing vacuum cause the brakes to be hard on the initial push?

 

I would have thought so, which is why it took a while to track it back to the replaced hose. Makes me think I might have been going crazy, but it defiantly showed up as needing a double pump.

Anyone else with firsthand knowledge of replacing this hose notice the same thing? Or the exact opposite?

 

I didn't think you were supposed to use silicone hoses for the brake booster since they are soft and collapse under vacuum.

 

I noticed my radiator hoses were looking a little worn, so I picked up the whole set from Z1:
http://www.z1motorsports.com/350_g35...oducts_id=5148

Other than the fact that they did not have the 1 way valves in them, the hoses were of good construction. I do not think they would have collapsed under typical vacuum.

*I notice now that they have a note at the bottom about reusing the 1 way valves from the stock hoses. My fault for not reading the directions I guess.