Brakes not working after Z32 Brake Swap?HELP! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Driven08 · 11-29-2011, 01:34 AM

I'm going to try to go into detail from what I remember.
To start, my car always had stock bmc and front 30mm Z32 calipers w/ ss lines. I did the rear ebrake set up with z32 calipers. I bought SS rear lines and after everything was bolted on(bleeders are all facing up), I installed a used 1" bmc that looked brand new on my existing booster. I then bench bled the bmc and started off bleeding from there.

After trying for a while, the front calipers wouldn't bleed and bleeders were completely dry(checked to see if they were clogged, ran a needle through them to be sure) and then I began again. Rear Z32 calipers work great but fronts don't do anything. I ended up rebuilding the front calipers and finding out the 1" wasn't working. I currently just put in a used AcDelco replacement bmc(1 1/16) and tried again(I have a brand new bmc on the side but I need the fitting so I didn't install yet btw). Now I did feed the front bleeders fluid and the fronts are now bleeding but the pistons on the front aren't functioning still.

I need help. What am I overlooking?

Cliff notes:
Installed rear z32 ebrake assembly, including calipers
Bench bled bmc
Rear's work, fronts don't grab(pistons stay in same position)
Tried another bmc, old one wasn't doing anything and I'm still in the same boat with the exception of the fronts bleeding but pistons aren't going anywhere.

rcdad123 · 11-29-2011, 02:25 AM

so fluid comes out of the front bleeders but the pistons wont push the pads against the rotors? the pistons could be stuck in the bores. is the brake pedal height normal or does it sink to the floor? if the brake pedal is pretty high when your standing on it and the pistons still dont work, they are stuck on the bores.

Driven08 · 11-29-2011, 02:35 AM

Pedal is mushy. Front calipers worked great before rebuild. They just weren't working after I did the swap. I rebuilt them to reassure myself they were fine and all the pistons looked fine. No scoring.

Sileighty_85 · 11-29-2011, 08:32 AM

didnt ready all of it,

Make sure bleeder valves are pointing upward

Driven08 · 11-29-2011, 10:56 AM

Yeah they are facing upwards. Next step I'm taking is buying a Might Vac and hopefully that solves the issue. Should just be air in the system

Adio · 11-29-2011, 10:58 AM

What disc are you using?

Memberofthe600hpkaclub · 11-29-2011, 11:14 AM

Urhmm did you start bleeding at the right rear then left rear then right front then left front

Driven08 · 11-29-2011, 05:07 PM

Quote:

Originally Posted by Adio

What disc are you using?

slotted 30mm fronts and slotted rear z32 rotors

Quote:

Originally Posted by Memberofthe600hpkaclub

Urhmm did you start bleeding at the right rear then left rear then right front then left front

Yeah I did that then moved to the fronts to try to focus on why they weren't working. I'm trying the Mighty Vac Tonight though

EDacIouSX · 11-29-2011, 05:11 PM

how did you rebuild it? Did you take the caliper halves apart and rebuild that or just swap in new bushings and pistons?

Driven08 · 11-29-2011, 07:49 PM

Quote:

Originally Posted by EDacIouSX

how did you rebuild it? Did you take the caliper halves apart and rebuild that or just swap in new bushings and pistons?

Took pistons out while calipers were assembled, removed seals from inside,Dissasembled calipers, installed new seals and lubricated them with brake fluid and put it all together.

Driven08 · 11-30-2011, 12:15 PM

ok so problem solved. Bench bled the bmc again and used the Mighty Vac for a while on each calipers starting on the right rear and moving all the way around. Brakes are now fully functional but still need a little bleeding.

11-29-2011, 01:34 AM	#1
Driven08 Post Whore! Join Date: Jul 2005 Location: Riverside, SoCal Posts: 4,801 Trader Rating: (354) Feedback Score: 354 reviews	Brakes not working after Z32 Brake Swap?HELP! I'm going to try to go into detail from what I remember. To start, my car always had stock bmc and front 30mm Z32 calipers w/ ss lines. I did the rear ebrake set up with z32 calipers. I bought SS rear lines and after everything was bolted on(bleeders are all facing up), I installed a used 1" bmc that looked brand new on my existing booster. I then bench bled the bmc and started off bleeding from there. After trying for a while, the front calipers wouldn't bleed and bleeders were completely dry(checked to see if they were clogged, ran a needle through them to be sure) and then I began again. Rear Z32 calipers work great but fronts don't do anything. I ended up rebuilding the front calipers and finding out the 1" wasn't working. I currently just put in a used AcDelco replacement bmc(1 1/16) and tried again(I have a brand new bmc on the side but I need the fitting so I didn't install yet btw). Now I did feed the front bleeders fluid and the fronts are now bleeding but the pistons on the front aren't functioning still. I need help. What am I overlooking? Cliff notes: Installed rear z32 ebrake assembly, including calipers Bench bled bmc Rear's work, fronts don't grab(pistons stay in same position) Tried another bmc, old one wasn't doing anything and I'm still in the same boat with the exception of the fronts bleeding but pistons aren't going anywhere.

11-29-2011, 08:32 AM	#4
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	didnt ready all of it, Make sure bleeder valves are pointing upward __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

11-29-2011, 10:58 AM	#6
Adio Leaky Injector Join Date: Jul 2011 Location: Ft Polk Age: 32 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	What disc are you using? __________________ ╭∩╮（︶︿︶）╭∩╮

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11-29-2011, 02:25 AM	#2
rcdad123 Zilvia Addict Join Date: Jul 2011 Location: san diego Posts: 639 Trader Rating: (0) Feedback Score: 0 reviews	so fluid comes out of the front bleeders but the pistons wont push the pads against the rotors? the pistons could be stuck in the bores. is the brake pedal height normal or does it sink to the floor? if the brake pedal is pretty high when your standing on it and the pistons still dont work, they are stuck on the bores.

11-29-2011, 02:35 AM	#3
Driven08 Post Whore! Join Date: Jul 2005 Location: Riverside, SoCal Posts: 4,801 Trader Rating: (354) Feedback Score: 354 reviews	Pedal is mushy. Front calipers worked great before rebuild. They just weren't working after I did the swap. I rebuilt them to reassure myself they were fine and all the pistons looked fine. No scoring.

11-29-2011, 10:56 AM	#5
Driven08 Post Whore! Join Date: Jul 2005 Location: Riverside, SoCal Posts: 4,801 Trader Rating: (354) Feedback Score: 354 reviews	Yeah they are facing upwards. Next step I'm taking is buying a Might Vac and hopefully that solves the issue. Should just be air in the system

11-29-2011, 11:14 AM	#7
Memberofthe600hpkaclub Zilvia FREAK! Join Date: Sep 2008 Location: Florida Age: 35 Posts: 1,038 Trader Rating: (17) Feedback Score: 17 reviews	Urhmm did you start bleeding at the right rear then left rear then right front then left front

11-29-2011, 05:11 PM	#9
EDacIouSX Post Whore! Join Date: Nov 2004 Location: Los Angeles Age: 35 Posts: 4,527 Trader Rating: (53) Rides Gallery: EDacIouSX Feedback Score: 53 reviews	how did you rebuild it? Did you take the caliper halves apart and rebuild that or just swap in new bushings and pistons?

11-30-2011, 12:15 PM	#11
Driven08 Post Whore! Join Date: Jul 2005 Location: Riverside, SoCal Posts: 4,801 Trader Rating: (354) Feedback Score: 354 reviews	ok so problem solved. Bench bled the bmc again and used the Mighty Vac for a while on each calipers starting on the right rear and moving all the way around. Brakes are now fully functional but still need a little bleeding.