Question about 1995 Mitsubishi Montero

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Pajero 1993 3 door 2.8 turbo

Hi, Please help with my brake problem. Brake warning light came on and pedal got very stiff. I suspected servo problem so checked vacuum at servo end of rubber pipe. Seems to be no vacuum at all (using finger to block pipe). Fluid level is fine. Can I do any tests to diagnose problem.

Thanks in advance.


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  • dax021 Oct 09, 2008

    Hi Garry (?), thanks for that advice. I also suspected the vacuum pump, but this model does not have it on the back of the alternator, it is separate unit which seems to be part of the waterpump. Any idea on how to test this unit?





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Pajeros have a common fault, the park brake warning light, is also connected to the brake fluid reservoir, if the fluid level is ok, the rubber boot inside the cap may be down, and pushing down on the float sensor in the reservoir, push the boot back up into the cap, it should not hang down below the edge of the cap.

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1 Answer

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As I understood,you had stiff brake pedal and the car on your attempt to start was not firing? and after 30 seconds it did? How the engine ran after the start? If I am correct stiffness on brake pedal,fault is either the check valve which is fitted inside the hose goes from the inlet manifold to the servo unit,stuck open and cause the engine have a vacuum leak . Or the servo unit itself stuck according to diaphragm move ability after the vacuum.If the brakes now are working as before and the engine as well,I suggest to remove the hose with the check valve inside test it and actually I recommend to renew it. It is for safety purpose,because this will happen even when you are in motion and God knows if you are in a speed and need sharp braking. Confirm first that it is the check valve or the Servo unit. Ask from an expert help.

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it sounds like you have a vacuum leak on the brake servo system.
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I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.

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