What are the Pros & Cons of Different Brake Bleeding Methods?

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Pump and hold method:

The pump and hold method usually requires two people, although it may be performed by one person if one-way bleed nipples or valves are fitted. During this method, the pedal and brake cylinder piston will travel beyond their normal range which might cause go down seals or incorporate corroded metal into the brake fluid.


Gravity method:

Multiple wheel cylinders or calipers are often bled simultaneously, although this can be only usually through with the gravity method which does not require pumps. The gravity method does take an extended time, typically several hours to switch all the fluid. Bubbles within the system may rise faster than the fluid drains, so it’s going to not be effective at bleeding but is usually sufficient for replacing old fluid with new. Gravity bleeding may be a very simple method requiring only 1 person. When the reservoir cap is removed and a bleed nipple opened, fluid drips slowly from the nipple because it’s below the reservoir. A hose is usually wont to collect the fluid in an exceeding container for safe disposal. The reservoir must be kept above the mint mark in the least times to avoid more air being drawn into the system.

Applying pressure to the reservoir or bleeding nipples, or applying a vacuum to the bleed nipples, makes the fluid flow through far more quickly than gravity alone. Replacing all the fluid takes only some minutes.

Different vehicles have different recommended bleeding patterns. Brakes are usually bled starting with the wheel that’s furthest from the piston chamber and dealing towards the wheel closest to the brake cylinder. This prevents bubbles within the system from being forced into pipes towards wheels that have already been bled.

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