Rear brake problem after Q45 front upgrade - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SaGang227 · 08-29-2006, 05:59 AM

Ever since I upgraded my front brakes to Q45 calipers, my rear brakes seem to be way hotter than front.
After driving, I can feel the heat at rear brakes and wheels are very hot, while front brakes are cool enough for me to touch them.
At first I thought it was just the heat, but something is wrong because my brand new rear pads are worn down to metal in 4 months.
I do not think that both rear calipers some how seized up at the same time because they turn in smooth when I turn them in and there is no rust on cylinder wall.
It cannot be parking brakes either because they are loosened up and when I look at the caliper, they are fully retracted.
I am guess it could be my master cylinder not working but I don't know how master cylinder failure can cause this.
Also, it's strange that it started after I upgraded my front calipers to bigger unit.
Thank you for your help.

TipStylez · 08-29-2006, 06:07 AM

Did you bleed your lines right, and did you only swap the front and left the rear stock, guessing your car is some type of 240sx.

SaGang227 · 08-29-2006, 06:40 AM

Sorry my car is 96 240SX.
I bleeded the whole system many times.
It almost feels like as if rear brakes are engaging way earlier than front, thus using rear brakes most of the time, which explains heat and wear.
Front calipers are reman from auto part store so I don't think they are bad.
Another thing to note is that I adjusted the rod length between master cylinder and booster for firmer brake feel, since brakes did not engage until they were close to the pedal.
However, if this is causing the problem, I would think that all 4 should be dragging, not just the rear.
What can it be

driftyour40 · 10-20-2006, 10:07 PM

adjust the rod length between master cylinder and booster back until it no longer drags.

08-29-2006, 05:59 AM	#1
SaGang227 Leaky Injector Join Date: Oct 2004 Location: Northern Virginia Age: 41 Posts: 93 Trader Rating: (0) Feedback Score: 0 reviews	Rear brake problem after Q45 front upgrade Ever since I upgraded my front brakes to Q45 calipers, my rear brakes seem to be way hotter than front. After driving, I can feel the heat at rear brakes and wheels are very hot, while front brakes are cool enough for me to touch them. At first I thought it was just the heat, but something is wrong because my brand new rear pads are worn down to metal in 4 months. I do not think that both rear calipers some how seized up at the same time because they turn in smooth when I turn them in and there is no rust on cylinder wall. It cannot be parking brakes either because they are loosened up and when I look at the caliper, they are fully retracted. I am guess it could be my master cylinder not working but I don't know how master cylinder failure can cause this. Also, it's strange that it started after I upgraded my front calipers to bigger unit. Thank you for your help.

08-29-2006, 06:40 AM	#3
SaGang227 Leaky Injector Join Date: Oct 2004 Location: Northern Virginia Age: 41 Posts: 93 Trader Rating: (0) Feedback Score: 0 reviews	Sorry my car is 96 240SX. I bleeded the whole system many times. It almost feels like as if rear brakes are engaging way earlier than front, thus using rear brakes most of the time, which explains heat and wear. Front calipers are reman from auto part store so I don't think they are bad. Another thing to note is that I adjusted the rod length between master cylinder and booster for firmer brake feel, since brakes did not engage until they were close to the pedal. However, if this is causing the problem, I would think that all 4 should be dragging, not just the rear. What can it be Last edited by SaGang227; 08-29-2006 at 11:51 AM..

08-29-2006, 06:07 AM	#2
TipStylez Zilvia Addict Join Date: May 2006 Location: Seattle, WA Posts: 918 Trader Rating: (0) Feedback Score: 0 reviews	Did you bleed your lines right, and did you only swap the front and left the rear stock, guessing your car is some type of 240sx.

10-20-2006, 10:07 PM	#4
driftyour40 Zilvia Addict Join Date: Jul 2003 Location: SoCal Age: 43 Posts: 644 Trader Rating: (1) Feedback Score: 1 reviews	adjust the rod length between master cylinder and booster back until it no longer drags.