Club126UK
Fiat 126 Chat => Fiat 126 Mechanical Problem Solving => Topic started by: amam on September 19, 2016, 12:41:56 PM
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i seem to be having a issue with my mca kit car
ive rebuilt the brakes, its got new rear cylinders/shoes and now front disc brakes and then ive fitted a new master cylinder
well it refuses to allow any brake fluid into the system, you can undo all the bleed nipples and all are dry
pumping the pedal doesnt do anything what so ever, even tried a eazibleed but its not pushing the fluid through
(https://scontent-lhr3-1.xx.fbcdn.net/v/t1.0-9/14344192_10208891226272069_7474198275675193037_n.jpg?oh=1bd478b7adba83b1c9608c34c37e7803&oe=586E3F2C)
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This is going to sound daft but did you feed the pin on the back of the brake pedal into the rear of the master cylinder?
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Perhaps your master cylinder requires "Bench Bleeding"..
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This is going to sound daft but did you feed the pin on the back of the brake pedal into the rear of the master cylinder?
yep fed it in when i fitted it, i thought this too so checked it by looking under dash
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Hi!
The position of the reservoir is a bit wierd. Judging by the picture the copper pipes seems to be higher than the lowest point of the reservoir.
Make sure that the brake hoses are OK. With the years they convert to turkish delight inside no matter if they look nice from outside. They are totally plugged or play as a non-return valve. If they are old enough, just change them anyway.
One last thing. Check if the pedal rod needs to be released. There must be a clearance of about 0.2-0.5mm between the rod and the master cylinder piston or 3-5mm free stroke on the end of the pedal. Not sure about the numbers, better check with the books. In case that the pedal is compressing the pistons, the inlet ports would be closed, so no chance for the fluid to pass through.
Have a nice evening!
Best regards!
Deyan
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I think Deyan could be onto something with the pedal/rod movement. IRC there was some sort of a spacer on my MCA under the master cylinder. I`ll try to see if I can find some old pictures before it was dismantled.
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Perhaps your master cylinder requires "Bench Bleeding"..
yes done that it made no difference sadly
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Hi!
The position of the reservoir is a bit wierd. Judging by the picture the copper pipes seems to be higher than the lowest point of the reservoir.
Make sure that the brake hoses are OK. With the years they convert to turkish delight inside no matter if they look nice from outside. They are totally plugged or play as a non-return valve. If they are old enough, just change them anyway.
One last thing. Check if the pedal rod needs to be released. There must be a clearance of about 0.2-0.5mm between the rod and the master cylinder piston or 3-5mm free stroke on the end of the pedal. Not sure about the numbers, better check with the books. In case that the pedal is compressing the pistons, the inlet ports would be closed, so no chance for the fluid to pass through.
Have a nice evening!
Best regards!
Deyan
you maybe onto something, i drilled the rivets out and lifted the reservoir which seemed to help but couldnt get it to pump fluid
the eazibleed has now bled the front but im getting no fluid out of both the rear cylinders so you maybe onto something with the brake hoses
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may of found the problem.....
since both rear cylinders wont bleed i thought i'd crack open a few brake pipes to see what happens
i undid both rear brake pipes which come out of the 3 way brake pipe block but nothing
i undid the supply pipe to it and it went everywhere, so will get this 3 way block off
(https://scontent-lhr3-1.xx.fbcdn.net/v/t1.0-9/14355701_10208893283443497_8334303661691660247_n.jpg?oh=6a9f12bf453d6f8aefd16dfa5a336c0b&oe=586B1215)
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ive now got a brake pedal ;D