Should I change the complete brake booster or the Master cylinder

[abdulrehmanrauf]

On the first day of Eid ul Fitr this year, my Charade 86 had a brake failure due to negligence of workshop guy. The rubber pipe linked to caliper, was touching the wheel, resulting in brake fluid leakage.

You may skip the bracketed lines...
[The car was full to capacity and we had a narrow escape, due to Eid there was no or very less traffic (SITE area Karachi). Thankfully, I got enough distance to park my car safely using hand brake and engine compression.]

Due to brake failure, I was in shock and I pressed brake pedal many times which might have caused dry run of piston in the master cylinder. Problem now I am facing is that when I softly/slowly press the pedal, the brake does not work and pedal simply reaches to its limit without generating any pressure. Pedal works fine when I press pedal quickly. Mechanic told me that this is happening due to weak seals / piston creating gape losing the compression in the master cylinder.

Now I want your opinion whether I should go for booster replacement (Kabli or New) or simply install the brand new Master cylinder with new seals and all for my Charade 86.

Much regards.

[Xulfiqar]

On the first day of Eid ul Fitr this year, my Charade 86 had a brake failure due to negligence of workshop guy. The rubber pipe linked to caliper, was touching the wheel, resulting in brake fluid leakage.

You may skip the bracketed lines...
[The car was full to capacity and we had a narrow escape, due to Eid there was no or very less traffic (SITE area Karachi). Thankfully, I got enough distance to park my car safely using hand brake and engine compression.]

Due to brake failure, I was in shock and I pressed brake pedal many times which might have caused dry run of piston in the master cylinder. Problem now I am facing is that when I softly/slowly press the pedal, the brake does not work and pedal simply reaches to its limit without generating any pressure. Pedal works fine when I press pedal quickly. Mechanic told me that this is happening due to weak seals / piston creating gape losing the compression in the master cylinder.

Now I want your opinion whether I should go for booster replacement (Kabli or New) or simply install the brand new Master cylinder with new seals and all for my Charade 86.

Much regards.

.

Its not too bad of a job.

at most you need to replace the brake rubber pipe on the wheel and do a full bleed, Before the bleed you will need to bench bleed the master cylinder itself correctly.

To do the wheel bleed use a pipe/bottle setup to get all the air out.

If your brake fluid was ancient and looked black like a gutter then its suspectible that your brake master cylinder is rusted inside - its pretty easy to inspect once you remove the tail end circlip/lock from the unit. If its not rusty then reassemble with new washers and a touch of silicone grease to aid in install and everything will be sweet again.

[tintin1]

This post was flagged by the community and is temporarily hidden.

[abdulrehmanrauf]

Xulfiqar, the repair work was done on the very first working day after Eid. Rubber pipe replaced with proper fitting using original clamps. Currently there is no leakage in the system, checked thoroughly. Its been months and the brake oil in the reservoir still very fresh, no sign of blackish shade.

Before writing here on PW I consulted second mechanic and he also told me to get bleeding again.

Then I asked my first mechanic to re-bleed. Should I consult another mechanic for bleeding one more time? Because the problem as stated above (soft pedal) is still there ? Or should I proceed for master cylinder repairing work.

.

Its not too bad of a job.

at most you need to replace the brake rubber pipe on the wheel and do a full bleed, Before the bleed you will need to bench bleed the master cylinder itself correctly.

To do the wheel bleed use a pipe/bottle setup to get all the air out.

If your brake fluid was ancient and looked black like a gutter then its suspectible that your brake master cylinder is rusted inside - its pretty easy to inspect once you remove the tail end circlip/lock from the unit. If its not rusty then reassemble with new washers and a touch of silicone grease to aid in install and everything will be sweet again.

Follow exactly as Xulfiqar described.
you better take its print out, translate it and tell to mechanic to do exactly same.
and feel free to keep smacking the backside of his (mechanic's) neck if he does not do so.

[metalhead]

Currently your brake pedal is soft or it is sinking at light press?

️ ️