Wheel Bearing Housing, Servicing

Special tools and workshop equipment required 

• Brake Caliper Repair Kit:VAS 6627A 
• Brake Caliper Thread Repair Kit - Set 8 :VAS 6627/8 
• Brake Caliper Thread Repair Kit - Set 9:VAS 6627/9 

Requirement

• All procedures are to be carried out by hand without additional tools when servicing the thread.

Brake Caliper Repair Kit:VAS 6627A 

-- Required:

1 -  Drill Template

2 -  M12x1.5 Fitting Bolt

3 -  M14x1.5 Fitting Bolt

4.1 -  Brass sleeve M12 (for special drill bit and mill for seating)

4.2 -  Brass Sleeve M12 (for thread tap)

5.1 -  Brass Sleeve M14 (for special drill bit and seat miller)

5.2 -  Brass sleeve M14 (for thread tap)

6 -  Tensioning Tool

7 -  Cutting Oil Container

Brake Caliper Thread Repair Kit - Set 9:VAS 6627/9 

-- For front wheel bearing housing thread M14 x 1.5:

1. Special Drill Bit
2. Seat Giller
3. Tap M14x1.5
4. Insertion Tool M14x1.5
5. Thread Inserts M14x1.5

Brake Caliper Thread Repair Kit - Set 8 :VAS 6627/8 

-- For rear wheel bearing housing thread M14 x 1.5:

1. Special Drill Bit
2. Seat Giller
3. Tap M12x1.5
4. Insertion Tool M12x1.5
5. Thread Inserts M12x1.5

Procedure

The description is given as an example for the rear brake caliper.

-- Remove the brake rotor:

• Refer to BRAKE ROTOR, REMOVING AND INSTALLING .
• Refer to BRAKE ROTOR, REMOVING AND INSTALLING .

-- Secure the drilling template -1- with the respective fitting bolt -2-.

-- Slide the brass sleeve -A- onto the special drill bit -B- from behind -arrow 1- so that the special drill bit edges do not damage the brass sleeve.

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-- Insert the special drill bit together with the brass sleeve into the drilling template -C- -arrow 2-.

-- Place the tensioning tool -1- on the special drill bit -2- and tighten.

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-- Drill deep enough by hand until the tensioning tool -1- makes contact at the brass sleeve -arrows A-.

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Tip

The special drill bit from the tool kit has the appropriate length (including the template) for the correct hole depth.

-- Loosen the locating bolt -2- slightly and then pivot the drilling template -1- to the side.

-- Insert the seat miller -2- into the tensioning tool -1- and lower the hole until the stop depth of the seat miller.

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-- Stop depth of the miller.

Requirement

• -A- = stop depth at the miller.

-- To check the depression depth, insert the threaded bushing -1- in opposite direction, that is with the seat -A- being inserted first into the depression.

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Requirement

• It must be possible to insert the seating of the threaded bushing all the way into the depression.

-- Remove the shavings.

-- Pivot the drilling template -1- over the hole and secure with the locating bolt -2-.

-- Slide the appropriate brass sleeve -D- onto the thread tap -E- from behind -arrow 1- so that the thread tap cutting edges do not damage the brass sleeve.

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-- Put some cutting oil on the tap.

-- Insert the thread tap together with the brass sleeve into the drilling template -C- -arrow 2-.

Tip

Initially the brass sleeve sticks out slightly from the drilling template, however the guide can still be used.

-- Place the tensioning tool -1- on the thread tap -2- and tighten.

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-- Cut deep enough using the tap until the tensioning tool -1- makes contact at the brass sleeve -3- -A arrows-.

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-- Clean shavings and cutting oil from the hole.

-- Turn the thread insert -1- onto the insertion tool -2- by hand -arrow- until slight resistance is felt.

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Requirement

• The thread insert must not be turned completely onto the insertion tool, because the thread insert would be prematurely deformed.

-- Install the thread insert -1- by hand using the insertion tool -2- until it is flush with the wheel bearing housing -A- surface.

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Requirement

• While doing so, the insertion tool -2- must not be inserted any farther into the thread insert -1- before the thread insert -1- is flush with the wheel bearing housing -A-.
• The thread insert must be completely covered by the wheel bearing housing, otherwise the secure fit of the brake caliper is not guaranteed.

-- Tension the tensioning tool on the insertion tool -2- and turn the insertion tool through the thread insert -1-.

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• The installation resistance becomes noticeably greater.
• At the same time, the threads of the thread insert -1- are pressed into the wheel bearing housing -A-.

The thread repair is completed when the insertion tool -2- can be easily turned through the threaded bushing -1-.