spongy mushy brakes

[vxlc80]

skidoo i forgot to mention that there is always air on the line that doesnt hold much bleed many times other 3 lines is fine

 

[Skidoo]

The master cylinder is under brake fuild tank. Have not seen any parts view of valves.
Always getting air out of that one is something different. Are you maintaining brake fuild level in tank above minimum mark when you bleed? Also are you bleeding with key in full on position?

 

[vxlc80]

The master cylinder is under brake fuild tank. Have not seen any parts view of valves.
Always getting air out of that one is something different. Are you maintaining brake fuild level in tank above minimum mark when you bleed? Also are you bleeding with key in full on position?

yes fluid on below low mar and yes key in on position i only have 1 tire that has a prob with air its also the same tire that doesnt hold much rear left

 

[NMuzj100]

Sounds like a slow leak that lets air into the line or caliper causing the poor performance.

Piston seals in the caliper ?

 

[vxlc80]

Sounds like a slow leak that lets air into the line or caliper causing the poor performance.

Piston seals in the caliper ?

sorry my bad typograpcl error my fluid level doest go down consistent on full level. thats why im confused where is the air comming from it only occur on one specific tire

 

[NMuzj100]

It's possible the leak doesn't let fluid out but does draw air in when the pressure is released. Are you saying that you get air bubbles from the caliper when you bleed it ?

Have you torn down and inspected that caliper for stuck pins/obstructed guides ect ...

 

[vxlc80]

It's possible the leak doesn't let fluid out but does draw air in when the pressure is released. Are you saying that you get air bubbles from the caliper when you bleed it ?

Have you torn down and inspected that caliper for stuck pins/obstructed guides ect ...

yes lots of air when i crack the rear left which i bleed lots of time other 3 is fine

checked the caliper pins are ok and no leak

 

[Skidoo]

We are up to almost 50 posts saying pretty much the same thing. Orginal poster has had trouble providing full infomation on condition and actions taken. Recommend only course of action is to take this to a dealer for repair, we want you to be safe.

 

[vxlc80]

lets wait for NMuzj100 i would like to hear his opinion

 

[vxlc80]

Good news!!!

solved my spongy mushy brakes!!! finally!!!

 

[Marco7]

So, what was the culprit?

 

[vxlc80]

So, what was the culprit?

i change master cylinder piston kit it has an internal leak

 

[NMuzj100]

How difficult was the install of the MC piston kit?

It would be nice if someone could do a MC piston kit write-up.

 

[vxlc80]

How difficult was the install of the MC piston kit?

It would be nice if someone could do a MC piston kit write-up.

changing the MC is really easy removing the MC assembly is kinda hard because of the lines thats it.

 

[NMuzj100]

Did you replace the whole master cylinder with a new unit or did you use a parts kit to rebuild the MC ?

 

[100 TD]

How difficult was the install of the MC piston kit?

It would be nice if someone could do a MC piston kit write-up.

Remove master cylinder, remove C clip, remove old piston, insert new piston, replace C clip, replace master cylinder, bleed brakes, drive away. For more info refer to FSM(carefully remove and don't score the bore)
How's that?

Yep I'd like clarification if he only did the piston, he sort of said that but then mentioned changing the MC is easy.........

i change master cylinder piston kit it has an internal leak

changing the MC is really easy removing the MC assembly is kinda hard because of the lines thats it.

 

[vxlc80]

Remove master cylinder, remove C clip, remove old piston, insert new piston, replace C clip, replace master cylinder, bleed brakes, drive away. For more info refer to FSM(carefully remove and don't score the bore)
How's that?

Yep I'd like clarification if he only did the piston, he sort of said that but then mentioned changing the MC is easy.........

just the piston kit

 

[NMuzj100]

Remove master cylinder, remove C clip, remove old piston, insert new piston, replace C clip, replace master cylinder, bleed brakes, drive away. For more info refer to FSM(carefully remove and don't score the bore)
How's that?

Sounds pretty straight forward and looks pretty easy in the FSM. I would definitely try this before replacing the whole unit at $1500.

 

[100 TD]

Sounds pretty straight forward and looks pretty easy in the FSM. I would definitely try this before replacing the whole unit at $1500.

For some reason my earlier post about changing the piston is not in this thread, funny thing, I say it on every other brake MC thread, where has it gone? The first thing to do is spend the $50 and change the piston, I don't know why there is so much aggravation and uncertainty about it?

Look at my last reply, it is saying how easy it is to change the piston; I didn't go back to see if my very early post to change the piston was there?

 

[Aaron13]

i change master cylinder piston kit it has an internal leak

So just for clarification....how much is this MC piston kit and where do you purchase it? I did a few searches on google and only find the entire MC.