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自転車アクセサリー Shimano BR-M755のPDF サービスマニュアルをオンラインで閲覧またはダウンロードできます。Shimano BR-M755 41 ページ。 Disc brake systems

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If oil adheres to the brake pads after oil is added, or

if the brake pads are worn down to a thickness of 0.5

mm, or if the brake pad presser springs are interfering

with the rotor, replace the brake pads.

Remove the wheel from the frame, and remove the

brake pads as shown in the illustration.

Clean the pistons and

surrounding area.

Place the bicycle so that the

reservoir tank is parallel to the

ground, and then remove the

reservoir tank cover.

Push the piston back in as far as it will go, while

being careful not to twist it. (Note that some oil

may overflow from the reservoir tank at this time.)

Install the new brake pads, and then install the pad

spacers.

Pad spacer

3 mm Allen key

Brake pads

3 mm

Allen key

Piston

Tightening torque:

2 - 4 N·m {18 - 35 in. lbs.}

Depress the brake lever several times to check that

the operation becomes stiff.

Check that the rotor and the brake pads do not

touch each other, and then check the oil level

(adding more oil if required). After doing this,

replace the reservoir tank cover.

Give the pad spacers to the customer also.

Adjustment when the pistons

are not operating correctly

If these pistons do not operate properly or if they

protrude unevenly, or if the brake pads remain in

contact with the rotor, adjust the pistons by the

following procedure.

Remove the wheel and the brake pads.

Clean the pistons and surrounding area, and

remove the reservoir tank cover.

Push the pistons back in straight, without bending

them. Note that some oil may overflow from the

reservoir tank at this time.

Install the brake pads and the pad spacers.

Depress the brake lever as far as it will go, and

then operate it several more times so that the

pistons all move to their initial positions.

Remove the pad spacers, install the wheel, and

then check that there is no interference between

the rotor and the calipers. If they are touching,

adjust using shims.

After checking the oil level, replace the reservoir

tank cover.

Brake fluid replacement

Attach a tube with a bag to the bleed nipple, and

then open the bleed nipple and drain out the oil. You

can operate the brake lever at this time to help the

oil to drain out. After draining the fluid, pour in fresh

brake fluid while referring to "Adding the brake fluid

and bleeding air". Use only genuine Shimano mineral

oil as the brake fluid.

Dispose of the waste oil according to proper country

and/or state disposal regulations.