1998 Mitsubishi Montero how to test brake pump

Tiny
GIO6191993
  • MEMBER
  • 1998 MITSUBISHI MONTERO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 155,055 MILES
I want to know how to test and replace a brake pump
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Saturday, January 23rd, 2010 AT 12:04 PM

5 Replies

Tiny
MATHIASO
  • MEMBER
Hello gio6191993

Welcome to 2carpros.

I could not find brake pump, do you mean master cylinder, power booster,
Can you explain what problem you have with your brake right now.
Thanks
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Sunday, January 24th, 2010 AT 1:32 PM
Tiny
GIO6191993
  • MEMBER
My brakes are not responding my car stops but it doesn't respond the way they usually do I changed the brake and its still the same its like there is no pressure on the brakes it starts slowing down when I have pressed the brakes almost all the way down
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Sunday, January 24th, 2010 AT 7:27 PM
Tiny
MATHIASO
  • MEMBER
Thank you for giving me more information

Check the brake fluid level, if the level is low, you might have a leak causing air to enter the system.
Now, if the brake fluid level is good and pedal sinks to floor when brakes are applied, you have a bypass in the master cylinder primary piston cup.
When the master cylinder's pistons and/or bore become worn, the pistons won't hold pressure and the brake pedal will gradually sink when the brakes are applied.
Here is what you need to do.
Open the fluid reservoir filer cap, while a helper is applying the brakes, look for strong waves (brake fluid movement in the reservoir)the bypassing on the primary piston is occurring.
If the master cylinder is worn, however, then replacement is recommended.
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Sunday, January 24th, 2010 AT 9:36 PM
Tiny
GIO6191993
  • MEMBER
What if there is no movement? What should I do and if it needs replacement how can I do it?
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Monday, January 25th, 2010 AT 1:15 PM
Tiny
MATHIASO
  • MEMBER
If the brake fluid is unchanged, and the pedal is sinking to the floor, the only possibility is the bypass in the master cylinder or depending how you describe the problem, there may be air in the system, but I doubt that one because you never have to bleed the brake, right?
Have the master cylinder checked and come with result.
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Tuesday, January 26th, 2010 AT 1:15 AM

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