hi all i got a 95 accord ex, just swapped a 99 spindles and calipers and rotors on to the other day and i switched a new master but as soon as you start it it looses pedal, friend told me it could be the proportioner valve any suggestions are welcome thanks-chris

 

please do not post the same questions in more than one section of this forum

https://www.hondaaccordforum.com/for...15/help-47737/

The answer is you have air in the system.

Did you bench bleed the master before you installed it?

it is very hard to get air from the master down to the calipers and out the bleeder valve.

That is why masters are bled on the bench before they are installed.

I recommend getting a reverse bleeder at this point

A reverse bleeder pushes fluid from the caliper into the master.

 

Personally, I would not reverse bleed the system.

I would probably remove the master cylinder, then bench bleed it. Then I would try bleeding the lines.

Are the bleeder valves on the front calipers pointing up or towards the ground?

 

Are you losing brake fluid anywhere? Check carefully.

If no leaks, then bleeding should be repeated to insure no trapped air.

If no leaks and bleeding doesn't help, the master cylinder likely has an internal leak by the piston that allows pressure to gradually decline. This is a common failure mode for master cylinder.

Suggest OEM MC to avoid any surprises on contact gap between MC and brake booster. This is a real pain to adjust and aftermarket part increases possibility of this being necessary.

good luck