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Radioactive Man

Active Member

• Jan 14, 2014

• #1

Not really happy with my brakes, they work but don't really feel like they are working 100%.

Have checked the vac pump and that's ok, checked the servo to see if the pedal sinks a little when you start the engine, that the pedal stays ok if depressed and engine turned off etc and the servo seems ok.

Then I did a little bit of searching on here and found that sometimes you could get bubbles in the brake fluid if the master cylinder seals are suspect etc. all ok here too.

But I did notice that when the brake pedal is pressed the body of the servo seems to expand or balloon in the direction the piston is pushing. Is this normal, I don't really know but I want to get to the bottom of this.

Cheers for the help as always.

Ian.

 

jamesmartin

Well-Known Member

• Jan 14, 2014

• #2

Radioactive Man said:

Not really happy with my brakes, they work but don't really feel like they are working 100%.

Have checked the vac pump and that's ok, checked the servo to see if the pedal sinks a little when you start the engine, that the pedal stays ok if depressed and engine turned off etc and the servo seems ok.

Then I did a little bit of searching on here and found that sometimes you could get bubbles in the brake fluid if the master cylinder seals are suspect etc. all ok here too.

But I did notice that when the brake pedal is pressed the body of the servo seems to expand or balloon in the direction the piston is pushing. Is this normal, I don't really know but I want to get to the bottom of this.

Cheers for the help as always.

Ian.

Click to expand...

does pedal sink when pedals pressed and held when engine is then started if not servo isnt working either due to it or no vac

 

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Radioactive Man

Active Member

• Jan 14, 2014

• #3

Hi James,

Thanks for the swift reply.

Foot on pedal, start up and pedal drops down an inch or two then holds.

Engine running, foot on pedal, engine off and pedal stays at that level, doesn't sink.

Not sure what to think...

 

jamesmartin

Well-Known Member

• Jan 14, 2014

• #4

sounds ok then ,check calipers and pads etc in that case

 

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Radioactive Man

Active Member

• Jan 14, 2014

• #5

Thanks James, will have a look at those next.

Ian.

 

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Radioactive Man

Active Member

• Jan 15, 2014

• #6

Hi James

What is worth checking on pads, calipers and discs. It doesn't pull to one side so I guess it's not a sticky calliper?

Ian

 

jamesmartin

Well-Known Member

• Jan 15, 2014

• #7

glazed pads ,and seized pistons

 

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Radioactive Man

Active Member

• Jan 15, 2014

• #8

Thanks James. Always appreciate your answers. Have a good day.

 

timtheenchanteruk

Well-Known Member

• Jan 15, 2014

• #9

jamesmartin said:

glazed pads ,and seized pistons

Click to expand...

Wot he said, or contamination from oil/grease.

for the price id be tempted to change the pads anyway if they are on the worn side, then you're sure