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Brake problems

Tiny
ASPENADMIN
  • MEMBER
  • 1975 MERCURY COMET
  • AUTOMATIC
  • 67,899,165 MILES
By the way I have a second car. A dented car listed above. The brake pedal feels firm like is working normally but the car does not stop at all. Last time I wound up behind a brand new Ferrari and I had to back off because I was getting too close as I speeds through an intersection. It must have made the owner of that Ferrari very nervous to look in his rear view mirror and see me coming up fast driving a beat up, dented 1975 Mercury Comet barreling down behind him. My brakes was not good.
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Sunday, January 27th, 2019 AT 9:12 PM

15 Replies

Tiny
SEVAG P
  • MECHANIC
  • 405 POSTS
Hi aspen.
it seems brake pads are too old dried out ,as a first step replace front and rear brake pads,check the rotors for rust , chips, lateral run out ,also check the brake fluid quality replace it if its dirty (black in color)or not replaced more then 2 years. check the guide: https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd.
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Monday, January 28th, 2019 AT 10:28 AM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
When I was driving brake pedal was like this, firm but not slowing.
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Thursday, January 31st, 2019 AT 9:28 AM
Tiny
SEVAG P
  • MECHANIC
  • 405 POSTS
Hello,

Hold pressure on the pedal while you start the engine. When the engine starts, the pedal should drop a 1/4", this indicates that booster is working properly.
1:if not remove vacuum line from the servo booster turn on the engine you must feel strong vacuum, check one way valve it must pass vacuum in one direction, if they are okay then brake booster defected.
2:if yes brake pedal drops, then brake pads are in bad condition bad quality, or too old)or hydraulic brake lines clogged, or it can be caliper pistons rusted and blocked.
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Thursday, January 31st, 2019 AT 10:07 AM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
Yes, the brake pedal drops.
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Sunday, February 10th, 2019 AT 7:58 AM
Tiny
SEVAG P
  • MECHANIC
  • 405 POSTS
Hello,

Have you checked brake caliper pistons if they are working properly? Or the brake pads if they are dried old.
If they are replace brake pads.
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Sunday, February 10th, 2019 AT 10:17 AM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
Brakes are old. I don't know for the piston.
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Thursday, February 28th, 2019 AT 10:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
It sounds like you need to replace the master cylinder. here is a guide to help:

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Please run down this guide and report back.
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Monday, March 4th, 2019 AT 10:45 AM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
How will master cylinder affects my brakes?
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Tuesday, March 5th, 2019 AT 9:41 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
If it is worn out it will internally bypass causing the low pedal.
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Tuesday, March 5th, 2019 AT 10:13 AM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
Will my car stop?
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Tuesday, March 5th, 2019 AT 5:56 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Nope, I would not drive it.
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Wednesday, March 6th, 2019 AT 2:32 PM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
I was driving and this happened.
Video (Click to make bigger)
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Wednesday, March 6th, 2019 AT 7:29 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
That brake pedal does not look like a 1975 Comet?
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Thursday, March 7th, 2019 AT 9:29 AM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
Oh sorry. I sent you the wrong video.
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Thursday, March 7th, 2019 AT 9:47 AM
Tiny
ASPENADMIN
  • MEMBER
  • 20 POSTS
Will I be able to brake in time?
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Wednesday, March 13th, 2019 AT 11:11 AM

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