Need Urgent Help for Sinking Brake Pedal

[seismic84]

Dear all,
ihave toyota passo 2007 1300 cc Racy , am facing brake pedal sinking issue by the past many months , On Pakwheels everyone suggested me to replace Master Cylinder , i did it but after some days again pedal touched floor ,mechanic performed bleeding procedure and issue resolved but yesterday same thing happened ,in morning when i checked break it was working fine as normal . Am confused now what can be the issue now am driving not more than 80 km/hr because of fear of break failure , need your expert opinions .

[omersiddiqui5482]

Bhai it is a seal leak. happened once in our Passo 2011, if the car is not giving any ABS warning on the cluster, the seals in the Master Cylinder are probably gone, check the Brake Fluid Level in the car first, also check the wheels from inside if you see any sort of fluid leak then the seals in the wheels have gone too.

genuine new replacement seal kits available in the market.

[sleeper]

The replaced master cylinder was new or kabli....were its seals changed with it?
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Also is brake oil reducing or not?

[dani_kk]

City?

[seismic84]

Hi dear, it was kabli , seals not changed they fixed it as it was. When first master cylinder changed break oil was not reduced , but this time oil was reduced at low level .

[seismic84]

City ?

[sleeper]

If u still have ur old original MC, put new/genuine seals in it and put it back in car.....if not then put new seals in the exisitng MC u have.
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Then check for fluid leaks also as Omer said above, behind all 4 wheels.....maybe the drum brakes at back are oily...

[sk_cooldayz]

Happened with my Passo few years back and again last month.

First time it was the issue of master cylinder. This time, it was ABS unit leaking pressure. ABS light does not turn ON. But it was leaking the pressure internally. Had to replace the unit

[seismic84]

Yes i have original MC , i use to keep original parts in my inventory , am in Islamabad can you suggest me who can replace the seals ? ,
Fluid leak checked many times no leakage found . My mech said the rear wheel drum cylinders maybe taking air and may need to replace .

[seismic84]

Thank you omer for your suggestion , All 4 wheels checked no leakage found , i have also doubt in MC because its used MC not checked not tested . Fluid level only reduced once but then its ok since i topped up .

[sk_cooldayz]

Do you remember if it happened just after ABS triggered?

[seismic84]

I would like to first confirm MC if its ok or not because they installed Used (Kabli) maybe its seals are worn out , if not then iwill check for ABS , is there any way like scanner that show ABS pressure leakage ?

[sleeper]

Apologies....dont know about Isl
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Good, put the new seals in orig MC and put it back in ur car to check
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Aur ye 'maybe' wali mechanic ko chor dein....drums ko khol kr dekhna hoga if leaking or not.
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Mr Dani_kk asked u city because he has wrkshop in ISL i believe...pls reply to him and ask fr address

[seismic84]

Am in Islamabad .

[seismic84]

No its not , it just kissed floor without any special event ..anytime anywhere .

[dani_kk]

You can visit us at Dmotorsports Islamabad G12, location is present on Google maps.
Your issue will be resolved sir.
03455072961

[seismic84]

Hi , yesterday i intentionally tried to activate ABS on pebbles, ABS got activated swear vibration felt on brake pedal and then again pedal sank , before it was working fine , i stopped the car and after 20 min when i cranked the engine ,the brake pedal went to normal position and it was more firm and perfect . What does it mean ? ABS pressure leak ?

[seismic84]

Sure, Thank you

[sk_cooldayz]

yes seems like its ABS unit issue. My car used to do the same. I changed my complete unit for 6,000 and 3,000 labor. People also repair the unit. Be very careful when replacing the unit. Make sure it is not repaired.

[seismic84]

sure iwill visit my mech for ABS unit replacement .