1997 240sx Brake problem. need your advise

[[TRE05]97ka24DE]

I have a automatic 1997 240sx, I swaped in the q45 front brakes. and also did an sr20 swap. The only problem is I had the car sitting for a while because of the sr20 swap. anyways I have no brake pressure, with the engine not running if I pump the brake pedal it doesnt get hard. and the brakes have been Bleed countless times. I think its ether the brake booster or the MC. What do you guys think?

[Brandon1605]

Could be wrong here, but Im pretty sure its the MC. I think you have to upgrade it with the brakes.

[[TRE05]97ka24DE]

not most the time. but when people do the 300zx swap some of the people use that master cylinder. but the problem is I have no brake pressure....

[OutToWinPAHC]

How could you bled the brakes with a pedal that goes right to the floor with no pressure? Seems off.

Are the calipers installed with the bleeder on top?

Is the MC new?

Did you adjust the brake pedal piston?

Did you bench bleed the BMC?

Are you bleeding them right?

[AZ89two4Tsx]

Are you bleeding them right?

[[TRE05]97ka24DE]

theres little pressure but i dosent get hard. bleeder screws are down, do you think that is the problem? master cylinder is bench bled. I did it according to the USDM manual, and im doing what the manual says to do for bleeding. they are 1997 Q45 calipers

[YuNg1's_240sx]

97ka24DE] bleeder screws are down, do you think that is the problem?

As in not in? They should be tight. Have someone pump and hold the pedal, then you slightly open the valve, let it stop, then close it and have the person let go and do it all over. make sure you are starting from the RR side and ending with the FL side.

[[TRE05]97ka24DE]

no like as in the bleeders are on the bottom of the front calipers not the top

[SmithSR]

I can't tell if we're being trolled here..

Calipers are to be installed such that the bleeder screws are on top.

[[TRE05]97ka24DE]

ima try to swap the calipers tomarro. stupid mistake I hope that fixes it if not I will post.

[OutToWinPAHC]

bleeders have to be at the top.

[nightsauce]

when i did the z32 swap I had to change the MC because of a lack of pressure.

[YuNg1's_240sx]

97ka24DE]no like as in the bleeders are on the bottom of the front calipers not the top

there is your problem I believe. The air at the top of the caliper so when you bleed, the fluid comes out and not the air. Make sure you put the bleeder on the top and you should be good to go.

[[TRE05]97ka24DE]

its all good I swaped the calipers so the bleeder was on top. Thanks for helpping. everything works now. thanks again

[Yakawaka]

i had this same problem with the q45 calipers.. thanks to this thread i fixed it but i feel like a total moron.