Auto Repair - Roadshow forum

Question

Brake grinds and won’t slow down then goes back to normal

Hello. I’ve been having problems with my Suzuki swift 55 plate since I got it in August.

It began within the first week, where I broke quite hard and then my journey all the way home after that the brake would go all the way to the floor. It stayed like this, went to the garage next day and got new rear adjusters but they still felt dodgy. Bled the brakes and changed brake fluid couple weeks later and they went back to how they were originally - perfect.
However, 4 times I have been driving and randomly there is this grinding sound and the break pushes down slightly but I feel this grinding on my foot for a good 2 seconds and the car sways and then I regain control of the break. After having my brake fluid changed the brake progressively gets worse l and isn’t as strong but now it’s not too bad, until today where this thing happened again. Used the brakes after as hard as I could down a hill and they were completely fine.
I’m worried about how this happens randomly and don’t feel safe. Every time I ask the garage they say the brakes are fine and can only diagnose if they can make it happen but they can’t because it happens randomly. What do I do?

Thanks in advance for any help.

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All Answers

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Answer
Here's a thing.

In reply to: Brake grinds and won’t slow down then goes back to normal

I've heard of where "goes to the floor" creates trouble as the usual travel wears down the piston and rubber and then when you push to the floor it can create troubles in that area. Which is unrelated to the brake grind.

As to the brake grind my usual mechanic will take it apart to see what's up, replace what's needed and it's fine. Only had this happen a few times over the decades but it's a common area that needs repair. I'm most concerned about the goes to the floor story.

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landdchamp called it out.

In reply to: Here's a thing.

I didn't use the right term. When the pedal goes to the floor, after working fine for years the seals inside hit an edge internally and cause "master cylinder leaking pressure internally."

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Answer
Brakes

In reply to: Brake grinds and won’t slow down then goes back to normal

Hi; Brake dust buildup can sound like they are completely worn out and grinding. When I wash my vehicles, I use the hose to wash out as much as I can. The car washes don't do much for this.
What you are describing, it sounds like classic master cylinder symptoms. One time the pedal is normal, the next time it goes to the floor. If you are sitting at a traffic light with your foot on the brake
pedal, does it ever slowly creep to the floor? Assuming that you don't have a fluid leak, that would be the master cylinder leaking pressure internally.
Good luck.
Loren

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Oh , congratulations on the badge

In reply to: Brakes

I'm glad they finally have someone sufficient to cover this forum.

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