Rep Power: 268

Yes i know this has been talked about a dozen times.

DX/LX owners that have completed the swap. Does your brake pedal feel a little bit spongey?

I've completed the swap..Used the stock DX MasterCylinder, bled the lines, brake pedal feels spongey to me. The stopping ability of the car feels a little better, less lock up under hard braking.

Anyone else experience this? I'm using Acura EL (canadian) rear discs/e-brake cable.

should i re-bleed the brake lines?

or

Should i look for the Si-R (USDM Si) Mastercylinder

I've read that skipbarber on this site has completed this swap and without changing the prop valve/cylinder and has had no problems.

Thanks Guys

 
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Rep Power: 331

sponginess is always related to air in the lines. bleed them again and check your hoses for bulging or swelling. you dont need to replace your master cylinder to benefit from the swap, but i do suggest braided lines.

 
Rep Power: 319

you would also want to get the brake proportioning valve to actually use the rear disks to your advantage, and yes skipbarber is right you should re bleed your brakes and double check all of the lines

 
Rep Power: 331

the non-abs proportioning valve isnt compatible with the abs SI or EX 2 way. His only option is to change the master cylinder or get a custom milled proportioning valve. ive driven a car with a custom valve and compared to mine..it wasnt worth the extra money. i dont understand why people dont want to believe me. so, im going to try to explain this one last time.
DX/LX brake lines look like this:

part number 4 is a proportioning valve which takes two inputs from the master cylinder and then outputs from the same valve to the calipers.
EX lines look like this:

part number 4 is also a proportioning valve, however, it takes two ABS inputs and outputs to the rear brakes ONLY.

i do not know if the master cylinders are compatible between the LX/DX and the EX, but because the EX abs unit modulates braking to begin with, i cant imagine that it would make that much of a difference.

the only other thing i could maybe suggest to do is to bore out the rear outputs from the non-abs proportioning valve so it flows as much as the master cylinder, cut the rear lines and flare/fit them and install the EX or SI rear proportioning valve. this should technically work, but if it doesnt, you just hacked up your brake lines and youll have to get new ones.

 
Rep Power: 268

Bled the brakes still feels like ****..I'm taking her into a shop..i'll let you guys know whats the outcome.