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Nissan Safari 1990 brake pedal fade

Tiny
SONICONE
  • MEMBER
  • 1990 NISSAN PATROL/SAFARI
  • 6 CYL
  • 4WD
  • MANUAL
  • 400,000 MILES
Hi, i've got a nissan safari 1990 that has a fading brake pedal when engine is running, so far the master cylinder has been replaced, new rotors all round, new pads, rekitted callipers and new pistons fitted, but still have a fading pedal, the callipers are all sliding freely, theres no leaks, and if I clamp all the brake lines at four corners it's fine, could the propotioning valve at the rear be causing this problem?As it's the only part thats not new, the indicator(!)Light flashes breifly as the pedal is initially depressed, any help greatly appreciated.
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Friday, April 1st, 2011 AT 6:10 AM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Can you explain your meaning of fading in more details? I need to verify that I understand the situation correctly.
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Friday, April 1st, 2011 AT 9:58 PM
Tiny
SONICONE
  • MEMBER
  • 2 POSTS
Hiya, when holding pressure on the pedal while engine is running the pedal slowly drops to the floor, within about 10 seconds. Thank you for your reply.
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Saturday, April 2nd, 2011 AT 12:52 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
That is an indication of pressure leakage and it is due to either leaking or a bad master cylinder.

Check for leaks and if none found, check the master cylinder. The seals are leaking internally.
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Saturday, April 2nd, 2011 AT 4:56 PM

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