S13 Stiff brake pedal

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luki343
Posts: 7
Joined: Tue Feb 28, 2017 3:55 am
Car: 200SX s13 CA18
Location: Warsaw, Poland

S13 Stiff brake pedal

Postby luki343 » Mon Sep 20, 2021 2:06 pm

Hey,
I own s13 a few years (~10 :D) and from beginning has stiff pedal and long stopping distance, it's almost impossible to lock wheels on dry grippy road.
I tried rebuild all calipers, new dot4, uncountable times bleed air (with enginge on/off), new brake discs+pads, brake hose and nothing change...

Brake booster is airtight, check valve works.
My brakes are almost stock (93' s13 200sx abs), only s14 front calipers, and from beginning i have anti-lock warining light active (problably faulty abs control unit, because abs wheel sensors works fine on osciloscope).

Any ideas?


macgiver
Posts: 1079
Joined: Wed Jul 04, 2007 10:21 am

Re: S13 Stiff brake pedal

Postby macgiver » Mon Sep 20, 2021 2:15 pm

What do you mean " Brake booster is airtight " ?? Have you disconnected the vacuum hose going to the booster ( plug the engine vac side )to see what DIFFERENCE that makes in pedal force - to stop car , as a comparison ?

luki343
Posts: 7
Joined: Tue Feb 28, 2017 3:55 am
Car: 200SX s13 CA18
Location: Warsaw, Poland

Re: S13 Stiff brake pedal

Postby luki343 » Mon Sep 20, 2021 3:33 pm

macgiver wrote:
Mon Sep 20, 2021 2:15 pm
What do you mean " Brake booster is airtight " ??
i mean FSM (BR-8) "airtight check" and "operating check"
macgiver wrote:
Mon Sep 20, 2021 2:15 pm
Have you disconnected the vacuum hose going to the booster ( plug the engine vac side )to see what DIFFERENCE that makes in pedal force - to stop car , as a comparison ?
No but I will check it in the near future

macgiver
Posts: 1079
Joined: Wed Jul 04, 2007 10:21 am

Re: S13 Stiff brake pedal

Postby macgiver » Mon Sep 20, 2021 3:38 pm

I'll leave you with this - doing that "Booster elimination test " will leave you essentially with NO ASSIST , or in other words " manual - like brakes " thus necessitating EXTREMELY hard pedal pressure .

BE CAREFUL , go DRIVE WAY OUT IN BUMFUNCT ie NO TRAFFIC CONGESTION , NO RUSH HOUR !!!
I believe it's a bestest , and fastest way to discern a bad Booster , ya know .........be SAFE :yesnod

p.s. I see our timing was just seconds apart LOL


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