Skip to main content

Brake master cylinder overhaul #1

I started the overhaul of the brake master cylinder after the clutch slave cylinder.
This day’s work was removal and disassembly of the brake master cylinder.
My “onboro ALFA” is early type (Mk. I) 1750GTV RHD.  The brake master cylinder is made by BONARDI and it is installed on the frame under the floor together with the clutch master cylinder (this is made by BENDITALIA).

Regarding the removal, there was a little try and error.
(1) Remove the pipes
Then, I tried to separate the linkage rod connecting to the brake pedal.  However, the fixing nut was so hard that I changed the process.
(2) Remove the bolts fixing the brake master cylinder on the frame.
(These bolts were also fixing the clutch master cylinder penetrating the frame.)
(3)&(4) Separate the linkage rod from the brake pedal, and remove the brake master cylinder together with the linkage rod.
(The linkage rod and the pedal were fixed by a split pin.)


Next was the disassembly of the brake master cylinder.
(5) Fix the linkage rod with vise and remove the fixing nut.  Then, separate it from the rod of the brake master cylinder.
(6) Remove the piston inside the cylinder.  At first the piston was sticking with rust and could not be removed.  However, after moving it several times, rust was gone and the piston could be taken out.
(7) The condition of the piston was not bad.
(8) There was no remarkable scratch inside the cylinder.  It was also good condition.


(9) Disassembled parts.


I heard that the quality of the reproduction parts of the BONALDI type brake master cylinder was not good.  Therefore, I thought it would be better to overhaul and use the original brake master cylinder. I was a bit relieved with knowing that the condition of the brake master cylinder was good and it could be reusable. ♪


(My original blog was written on 8th Jun 2009)
Labels:

Comments

Post a Comment

Popular posts from this blog

Clutch master cylinder overhaul #3

I was still struggling with the sticking piston of the clutch master cylinder. I thought I should give up and look for the new part for the replacement.  And to for my curiosity , I started to destroy and disassemble the clutch master cylinder piston by drilling. When I was drilling the piston halfway , I didn ’ t have any specific idea , however , I thought to tap the piston to make the thread.  I started to turn the tap handle , and I felt the feeling that the piston was moved.  So , I tried to pull it , and then suddenly the piston was removed from the cylinder. Finally I could extract the rusty piston! I observed the extracted piston.  It looked there was no risk of the leakage of the fluid because the hole I made in the piston was not penetrated.  Thinking the function that this part only holding the rod connected with the clutch pedal , it could be reused if the hole would be filled by the hard material. However , before repairing the holed
Post a Comment
Read more

Clutch master cylinder overhaul #4

The overhaul of the clutch master cylinder , which I succeeded in the removal and repair of the piston with solder ( probably ), has been still continuing.  The master cylinder was disassembled and all parts were cleaned.  The condition of each part was not bad. In the last week the cylinder and rod were painted. Assembly started.  I checked the condition of the rubber parts originally used comparing with ones of the repair kit.  And I decided to use the original ones because the rubber was not deteriorated yet and the quality looked better than the repair kit ’ s one. Always the assembly is fast although I always struggled with the disassembly. Before After The overhauled master cylinder could be operated smoothly.  And I believe the appearance also became cleaner. ( My original blog was written on 26th Jul. 2009 )
Post a Comment
Read more