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Soft brakes and Loosing brake fluid

Tech Talk for Nissan owners.

Moderators: toaddog, V8Patrol

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Joined: Tue Aug 03, 2004 7:56 pm
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Soft brakes and Loosing brake fluid

Post by MARKx4 »

My brakes on my 88 GQ SWB patrol with 3" lift and 33s have become real soft latelly and ive been loosing breake fluid but i cant find where the fluid is leaking?

Any idea on what the problem could be and where is the best place to start fixing the problem.

MARKx4
Its not cool, unless it's got boost :)
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Post by Jacked »

from the back of the master cylinder into the booster
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Joined: Tue Aug 03, 2004 7:56 pm
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Post by MARKx4 »

Does that mean i need to change the master cylinder or the booster?
Its not cool, unless it's got boost :)
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Post by meiamaro »

If there are no obvious leaks,
Clamp rubber hoses's at diff. Now push brake pedal.

1/ if soft,undo master(no need to crack lines) and move it out
far enough to check if the rear seal is leaking.It should be.(new master needed)

2/ If hard, release font hose clamp and try again.
if soft you can isolate wich caliper by clamping the hose's on the caliper.

if its hard, repeat # 2 on the rear.
fluids/coolant just dont disappear,they must go sumwhere. ;)

Hope this helps

Cheers Ian.
GQ LWB TD42 Turbo,(ps.water does not compress.)
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Post by NutterGQ »

does the car have body lift? and dont forget to check proportioning valve
My bitch has boost, Nutter Engineering Turbo GQ
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Post by MARKx4 »

It doesnt have a body lift, ill have to check what has been mentioned. Thanks for the replys, keep them coming.
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Post by waandy »

i had same problem with me laser. brakes were soft an say if u stopped for an intersection ur foot would sink to the floor. was master cylinder. goes well now
85 hi top drover, 31s, 2 inch exended shackles 2 inch bl.
88 tb42 swb mav,35 claws, 4 inch lift
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Post by NutterGQ »

best bet start by clamping off then pull master back as mentioned.
My bitch has boost, Nutter Engineering Turbo GQ
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Joined: Sat Sep 11, 2004 9:40 pm
Location: Cairns, Nth QLD

Post by meiamaro »

NutterGQ wrote:does the car have body lift? and dont forget to check proportioning valve
Yea, always a good idea to bleed brakes when vehical is on the ground position(no axles hanging in the air)on axle stands is ok.
sometimes the prop valve give a ????? during bleeding.

Cheers Ian.
GQ LWB TD42 Turbo,(ps.water does not compress.)
Posts: 655
Joined: Thu Mar 20, 2008 12:51 pm
Location: melbourne

Post by Jacked »

if its "useing" fluid and he is needing to top it up its got nothing to do with proportioning valve unless the valve is leaking.

Mark just undo the 2 bolts that hold the master to the booster, bend it out a little and have a look. if its wet its the master. Thats as long as you have already looked around for a fluid leak at the calipers/lines/hoses
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Post by MARKx4 »

Ill check it out in the next couple of days. Loving the replys, allways need new info on fixing things.
Its not cool, unless it's got boost :)
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