Car skidding to one side on braking

[mujtabaayan]

My AE100 has developed a serious fault. It started skidding to left side while braking on speed. Following has been done so far:
1. Service of all 4 brakes
2. Rubber pipes connecting steel brake pipe with hubs have been replace.
3. Disk pads and leathers are perfect.
4. Front taway has been tooled.
5. The T joint supplying brake oil to all wheels has been replaced with kabli as new one is not available in market.
After replacing the T joint, now the car is skidding to right. Expert advice is requested how to tackle this serious fault because this may result in any accident.

[Panther]

Did you check the brake cylinder / booster. This is where the brake is energized. You have started the trouble shooting from wrong direction.

[mujtabaayan]

Its working fine

[capsat]

what was wrong with the proportioning valve ( T joint ).
ask your mechanic to check braking by isolating left & right wheels 1 by 1
@margallar @babarhyd @ser_gtr @syncview

[UAHMAD]

Pistons of brake calipers may also be checked if one or more are jammed.

[omersiddiqui5482]

Brother firstly there should be no Kabli Parts atleast for the Brakes there should be no Kabli parts... Have the seals inside the brake caliper checked... Oneside has more pressure that the other...

[margallar]

re-install the original valve.

take it to a good mechanic and get it bled properly

[nomi01]

Chk if piston is not jammed, calipers are floating freely, their pins r not struck

[mujtabaayan]

It was chocked, two ports were not working

[mujtabaayan]

All pistons serviced and working freely

[mujtabaayan]

Seals of both sides changed

[mujtabaayan]

The kabli one is also original and same like the old which is replaced

[mujtabaayan]

All these things already checked and working

[mujtabaayan]

From where i can get new original T in Rawalpindi??

[Xulfiqar]

sounds like the mechanic didnt read the markings on the ports or did something else. - like twisted the metal brake lines to the point of kinking them shut.

[mujtabaayan]

I saw some ports had unidirectional arrow, and a couple of them had bidirectional ones. He had idea of these and showed me different arrows. 2 ports were already chocked and another small T was used at the output to connect all the 4 pipes.
This mess was removed by replacing the old T with kabli one. Earlier car was skidding to right and now to left.
Moreover, when the front wheel piston seals were replaced, it was noticed that one piston was a bit smaller then the other one because the rubber ring from the same seal kit didn't fit on one piston and was loose.
Please guide what to do now

[Xulfiqar]

You found your issue already

Change the calipers completely or rebuild them with correct pistons and seals.

[mujtabaayan]

Can i change the piston only to match the size of pistons on bith sides or the whole caliper will be changed??
By the way, the difference in size is very minute, just some mm only.

[nomi01]

Both calipers shud be same, with same pistons. Basic fluid mechanics

[Xulfiqar]

see,

thats too sensible.. we should not tolerate sensibility