ブレーキキャリパー、マスターシリンダーのオーバーホール2【TZR250R 3XVレストア】

Summary

In this episode, the host tackles the challenges of restoring a TZR motorcycle, focusing on a particularly troublesome rear caliper repair. After unsuccessfully attempting to loosen a seized bleeder valve, leading to a broken extractor tool, the host decides to purchase a new caliper for a fraction of the cost, discovering a budget-friendly replacement from a TZR 125 that fits perfectly. The episode also dives into the meticulous cleaning of brake calipers, dealing with rust and stubborn dirt, and preparing for a master cylinder overhaul with an expensive repair kit. The journey concludes with detailed sandblasting and masking in preparation for repainting, promising more progress in future episodes.

Takeaways

• 😥 Mazan struggled to remove the rear brake caliper bleeder valve and ended up breaking it.
• 👷 Mazan bought a used rear brake caliper for just 999 yen since new ones are expensive.
• 🛠 Mazan disassembled and cleaned the brake parts thoroughly before sandblasting.
• 💨 Mazan switched to a suction-type sandblast gun which uses more air but is easier to use.
• ⚙️ The front brake caliper paint was hard to remove but the other parts cleaned up quickly.
• 🚿 Thorough cleaning is important after sandblasting to remove any remaining debris.
• 😅 Mazan forgot to overhaul the rear brake master cylinder until later.
• 💸 The overhaul kit for the rear master cylinder was very expensive for just 3 parts.
• 🎨 Masking and drying the parts properly before painting is time-consuming but important.
• 🏁 Mazan will paint and reassemble the brakes in the next video to complete the job.

Q & A

What was the issue with the rear brake caliper?

The bleeder valve was stuck tight and could not be loosened. Attempts to force it caused the bleeder valve and extra tool used to try to remove it to break.

How did Masan resolve the stuck rear brake caliper issue?

After failing to remove the broken bleeder valve, Masan gave up and bought a used rear caliper for a different model TZR that turned out to be identical and usable.

What kind of cleaning and preparation was done before painting?

The parts were cleaned thoroughly, media blasted to remove rust/paint, masked to protect certain areas, cleaned again carefully after blasting, and dried completely before painting.

What issue came up when reassembling the rear master cylinder?

A small fluid passage hole was found to be blocked. The parts had to be disassembled again to drill open the hole.

What types of sandblasting guns were used?

Initially a direct pressure type was used. Later a suction type blasting gun was used instead which was more powerful but used more air.

How was the front brake caliper paint removed?

The front caliper paint was difficult to remove and took a long time, while other parts came clean very quickly. The front caliper paint seemed to be a soft rubbery type that resisted blasting.

What masking was done and why?

Masking protected fluid passages and piston bores from getting blasting media and debris inside. It had to be redone carefully several times during the process.

Why was thorough cleaning done after blasting?

Even with masking, some blasting media still gets inside, so very thorough flushing and cleaning was done to avoid problems after reassembly.

How were parts dried after cleaning?

Compressed air was used to blow off moisture, then parts were warmed on a stove briefly to fully evaporate any remaining water before painting.

How many videos will cover the full brake job?

The project ended up spanning 3 videos due to the extra troubleshooting and repairs required.