HYDRAULIC BRAKE PISTON RESTORATION PROCESS
The next phase of the brake caliper restoration process involves inspecting and restoring the hydraulic brake pistons that were removed from both the front and rear brake calipers.
The goal here is to put the pistons through one final cleaning process and then assess their restored condition to determine whether they can be reused or be replaced with brand new hydraulic pistons.
https://i.postimg.cc/Mph2qvG8/1_All_Brake_Hydraulic_Pistons_2_(Before_Polishing).jpg
(Above) The current condition of all the hydraulic pistons after undergoing a deep cleaning and de-rusting cycle in the ultrasonic cleaning machine.
Before beginning the restoration work, I took a closer look at several areas of the pistons that still required additional cleaning.
https://i.postimg.cc/P5BsTPqs/2_close_Up_Of_existing_rust_inside_pistons.jpg
(Above) Rust deposits still remaining inside the inner barrel of the hydraulic pistons.
(Below) Some staining or contamination present on the outer surface of the pistons.
https://i.postimg.cc/9Qv5Crfh/2_Staining_or_marking_on_outer_surfaces_of_both_front_and_rear_pistons.jpg
Grinding Process
To tackle the remaining rust deposits first, I attached a small brass wire brush bit to my Dremel and carefully began grinding away the corrosion. This method proved to be very effective at removing the rust while leaving the underlying metal clean and shiny.
https://i.postimg.cc/NjWqB50F/3_After_wire_wheeling_inner_barrels_of_all_brake_pistons_1.jpg
(Above) Nearly all of the rust deposits have now been removed from the inner barrel surfaces, revealing clean metal underneath.
https://i.postimg.cc/Mph2qvG7/3_After_wire_wheeling_inner_barrels_of_Front_brake_pistons_1.jpg
(Above) The front brake caliper pistons came out looking great, with all rust removed. Only a couple of pistons still show minor pitting at the bottom of the inner barrel.
(Below) The rear caliper pistons actually turned out even better than the fronts after the grinding process.
https://i.postimg.cc/fbm4LD3V/3_After_wire_wheeling_inner_barrels_of_Rear_brake_pistons_1.jpg
I’m very happy with how well the wire brushing process worked. The pistons have cleaned up so nicely that I’m now unsure whether I should paint the inner barrels or simply leave them as they are.
What do you guys think — should I paint them or leave them bare?
Polishing Process
Next, I moved on to removing the staining or contamination that remained on the outer surfaces of the pistons.
To do this, I set up my electric drill in a bench vice and attached a cone-shaped polishing wheel. This created a simple DIY polishing rig that made the process much easier to control.
https://i.postimg.cc/wBLKvgtt/4_Polishing_Setup.jpg
(Above) With this setup I can safely hold the piston while polishing, without having to manage both the drill and the part at the same time. This gives me much better control and allows me to polish the piston surfaces more effectively.
Here’s the starting condition before polishing the first piston.
https://i.postimg.cc/bvkXJpGg/4_Test_of_polishing_process_on_outer_surface_of_Brake_Piston_(Before).jpg
(Above) It’s a little difficult to see in the photo, but there is a thin ring of staining along the upper section of the piston’s outer barrel. The goal is to remove as much of this contamination as possible using the polishing process.
After about five minutes of polishing, the results were impressive. All of the staining on the outer barrel of the first piston was completely removed.
https://i.postimg.cc/SKC0skXM/4_Test_of_polishing_process_on_outer_surface_of_Brake_Piston_(After_1).jpg
https://i.postimg.cc/zfKmB8Lw/4_Test_of_polishing_process_on_outer_surface_of_Brake_Piston_(After_2).jpg
(Above) As you can see, the contamination that was present on the piston surface has now been completely removed.
All that remained was to repeat the process on the rest of the pistons. Just like the first one, the results were excellent. The polishing process removed all visible contamination from the outer surfaces, making the pistons look almost brand new again.
https://i.postimg.cc/q7yfR4t1/5_All_Pistons_Polished.jpg
(Above) The polishing process was quick, simple, and extremely effective. I’m very happy with the results so far.
After successfully removing the rust deposits from the inner barrels of all the pistons and eliminating the contamination on the outer barrel surfaces, I am satisfied that these restored brake caliper hydraulic pistons are suitable for reuse. They can now be reinstalled into the front and rear brake calipers during the final stages of the restoration process.
By
DJ_Party_Favor ·
Proof of what can happen if a wife or girlfriend drags her husband or
> boyfriend along shopping
> This letter was recently sent by Tesco's Head Office to a customer in
> Oxford:
>
> Dear Mrs. Murray,
>
> While we thank you for your valued custom and use of the Tesco Loyalty
> Card, the Manager of our store in Banbury is considering banning you
and
> your family from shopping with us, unless your husband stops his
antics.
> Below is a list of offences over the past few months all verified by
our
> surveillance cameras:
>
> 1. June 15: Took 24 boxes of condoms and randomly put them in people's
> trolleys when they weren't looking.
>
> 2. July 2: Set all the alarm clocks in Housewares to go off at
5-minute
> intervals.
>
> 3. July 7: Made a trail of tomato juice on the floor leading to
feminine
> products aisle.
>
> 4. July 19: Walked up to an employee and told her in an official tone,
> "Code 3" in housewares..... and watched what happened.
>
> 5. August 14: Moved a 'CAUTION - WET FLOOR' sign to a carpeted area.
>
> 6. September 15: Set up a tent in the outdoor clothing department and
told
> shoppers he'd invite them in if they would bring sausages and a Calor
gas
> stove.
>
> 7. September 23: When the Deputy Manager asked if she could help him,
he
> began to cry and asked, "Why can't you people just leave me alone?"
>
> 8. October 4: Looked right into the security camera; used it as a
mirror,
> picked his nose, and ate it.
>
> 9. November 10: While appearing to be choosing kitchen knives in the
> Housewares aisle asked an assistant if he knew where the
antidepressants
> were.
>
> 10. December 3: Darted around the store suspiciously, loudly humming
the
> "Mission Impossible" theme.
>
> 11. December 6: In the kitchenware aisle, practised the "Madonna look"
> using different size funnels.
>
> 12. December 18: Hid in a clothing rack and when people browsed,
yelled
> "PICK ME!" "PICK ME!"
>
> 13. December 21: When an announcement came over the loud speaker,
assumed
> the foetal position and screamed "NO! NO! It's those voices again."
>
> And; last, but not least:
>
> 14. December 23: Went into a fitting room, shut the door, waited a
while;
> then yelled, very loudly, "There is no toilet paper in here."
>
> Yours sincerely,
>
Edward Thompson - Manager
:rofl: :rofl: :rofl: