Issues converting to non abs s14 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

johnnyhillen · 03-21-2025, 07:57 AM

Hi

My abs unit was not working. I couldn't find any where to rebuild the abs and the master cylinder was already leaking so I thought I would remove the abs and upgrade to a z32 master cylinder. I got a new hfm non abs z32 master cylinder and replaced all the brake lines. Plumbed it up as non abs using all three ports on the master cylinder. The car also has the 4 pot front and 2 pot rear calipers.

Even after bench bleeding a few times, many many hours work and several litres of brake fluid I could not get brake pressure so I assumed it was air trapped somewhere.

Brought it to a local mechanic who works on the odd track and rally car to get out pressure bleed. He has now phoned to say they couldn't get pressure and after his own research online onto the master cylinder says I should now block off one of the front ports on the master cylinder and put a t piece on the other to split between the front calipers as the master cylinder can't build up enough pressure.

Surely that can't be right. The standard master cylinder which is a lot smaller could build up the pressure so surely much larger z32 one will easily do it.

AKADriver · 03-21-2025, 11:30 AM

Did you plumb the ports in the right configuration? The front port is for the rear brakes, the two rear ports are for the front brakes.

It could be a defective master cylinder. Any "Z32" master cylinder you buy now is a new unit and not an old OEM reman and could just be out of spec.

03-21-2025, 07:57 AM	#1
johnnyhillen Join Date: Aug 2018 Location: GB Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	Issues converting to non abs s14 Hi My abs unit was not working. I couldn't find any where to rebuild the abs and the master cylinder was already leaking so I thought I would remove the abs and upgrade to a z32 master cylinder. I got a new hfm non abs z32 master cylinder and replaced all the brake lines. Plumbed it up as non abs using all three ports on the master cylinder. The car also has the 4 pot front and 2 pot rear calipers. Even after bench bleeding a few times, many many hours work and several litres of brake fluid I could not get brake pressure so I assumed it was air trapped somewhere. Brought it to a local mechanic who works on the odd track and rally car to get out pressure bleed. He has now phoned to say they couldn't get pressure and after his own research online onto the master cylinder says I should now block off one of the front ports on the master cylinder and put a t piece on the other to split between the front calipers as the master cylinder can't build up enough pressure. Surely that can't be right. The standard master cylinder which is a lot smaller could build up the pressure so surely much larger z32 one will easily do it.

03-21-2025, 11:30 AM	#2
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 43 Posts: 3,517 Trader Rating: (1) Feedback Score: 1 reviews	Did you plumb the ports in the right configuration? The front port is for the rear brakes, the two rear ports are for the front brakes. It could be a defective master cylinder. Any "Z32" master cylinder you buy now is a new unit and not an old OEM reman and could just be out of spec.