bottledjdm

i just finsh putting my new 5 lug on my eg hatch and now the brake pedal will not get hard when the car is on. I have bleed the lines change the master and I just dont know what to do.

BlueIntegraBoy

iTrader: (5)

Change your prop valve? What size MC did you put on?

bottledjdm

I put a stock 94 civic si master on it. but I have pressure in the lines ?? so doesnt that mean that the prop valve is working

instrument

your stock prop valve was meant for rear drums
you didn't mention if you changed it or not.

bottledjdm

no I didnt change it but that would stop the pedal from becoming hard

BlueIntegraBoy

iTrader: (5)

The stock Si is not going to cut it. You need a 91 Civic EX sedan 15/16" MC.

bottledjdm

so if I put a 94 civic ex <U>with abs </U>that is 15/16 will it work????

ComeOnKip

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bottledjdm &raquo;</TD></TR><TR><TD CLASS="quote">so if I put a 94 civic ex <U>with abs </U>that is 15/16 will it work????</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueIntegraBoy &raquo;</TD></TR><TR><TD CLASS="quote">The stock Si is not going to cut it. You need a 91 Civic EX sedan 15/16" MC.</TD></TR></TABLE>

built562

there is something else wrong.

just having the wrong prop valve will not cause there to be no pedal pressure at all.

so did you bench bleed the MC? and are you bleeding the wheels in the correct order?

bottledjdm

yea i did bleed it both ways so why is it that in my friends 92 civic dx it worked without changing anything???? so what should I change first...

B serious

iTrader: (1)

google: fluid dynamics. or pascal's principle.

lol or here's a crash course for your application:

A bigger master cylinder will cause a stiffer brake pedal because with a bigger master cylinder piston, you need more pressure from your foot to apply the same pressure to the caliper pistons. Using too big of an MC will cause excessive effort from your foot, but inadequate pressure being put into the pads and the discs.

A smaller master cylinder will cause the pedal to become more mushy and have more travel. This is because you're moving less fluid, but are magnifying pressure more effectively by using a small piston in the master cylinder. You will put more pressure on the brake caliper pistons and it will require less effort from your foot. Using too small of an MC will cause the brake pedal to have a lot of travel, and cause the brakes to be overly grabby. Almost like having a brake on/off switch. The pedal will be hard to modulate for correct pressure. It will be too much or too little.


A properly sized MC will get you good pressure and good modulation. It's a happy medium. Try the ITR MC. I believe the GSR MC is the same size....so the Si MC should be the same size also.

Bleed the brakes a LOT!! It took me a million hours to completely bleed out all the air from my lines after my 5 lug. Bleed the brakes with the car on. It's easier.

bleeding order:

Pass. rear, Driver rear, Pass. front, Driver front.

bottledjdm

I dont think they work because of the way they bolt on to the brake booster

BlueIntegraBoy

iTrader: (5)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bottledjdm &raquo;</TD></TR><TR><TD CLASS="quote">so if I put a 94 civic ex <U>with abs </U>that is 15/16 will it work????</TD></TR></TABLE>

It will not work unless you have the booster and get the larger fitting for one of the brake lines.

bottledjdm

thank you I got it fixed with a master that was bigger...

BlueIntegraBoy

iTrader: (5)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bottledjdm &raquo;</TD></TR><TR><TD CLASS="quote">thank you I got it fixed with a master that was bigger...</TD></TR></TABLE>