Information
(cont’d): Brake Pads
• Glazed surface

• Cracks from overheating

• Dust buildup at edges

• Contamination from sprays such as tire dressings

• Wear at contact points

• Piston contact on pad shows even or uneven pressure distribution

• Pad to caliper contact points show how pad moves in caliper

• Spring to pad contact shows how well spring tensions pad
Countermeasure

• Sanding the pad and chamfering the edges

• Insuring the contact points are smooth

• Lubricating contact points with optimol grease

• Insure proper fit and lubrication of shims and/or dampers

Note: Take photos as you inspect. Remember that part numbers and batch numbers must also be
readable. It is required on the PQIS job/warranty claim.

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1801 4636

Advanced Technical Information
Information
(cont’d): Rotos

• Lips develop at outer and inner edges of pad contact area

• Corrosion

• Contamination by sprays, fluids, road salt, grime, and small particles becoming embedded between the pad and rotor
• Glazed surface

Rotor Finish: The non-directional finish of a new rotor is better for noise than the polished rotor
resulting from light-footed braking.
Glazed pads and rotors are the fingerprint of the normal, light-footed, slow speed brake squeal.
Replacement of the pads and rotors with the same pads and rotors that are already on the vehicle,
will not improve the situation. As the new parts are subjected to the same conditions, the squeal
will return.

A glazed rotor is not a safety or performance issue.

Countermeasure
It is not possible to sand or hone the rotor due to the possibility of introducing judder because of
imperfect sanding or honing. Altering the driving habit by using a little more pedal force is sufficient
to improve the noise.

NOTE: Also, remember to photograph the rotor production information for the PQIS job/Warranty
claim.

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1801

Advanced Technical Information

Information
(cont’d): Calipers

• Pad Mounting Pins – witness marks indicate movement between pad and caliper pin

Countermeasure
• Make sure the pins are smooth first

• Lubricate contact points with a small amount of optimoly grease and insure proper fit of components
Tension spring
• M
ovement between spring and pads will vary as spring tension varies. The witness marks will
reflect this.

• Push upwards on pad against spring, release the pad and you should hear a clack. Excessive stiffness or weakness in the spring is not acceptable.

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Advanced Technical Information
Information
(cont’d): Caliper Pistons

• Wear marks from movement of pad against piston. This is an indication of pressure distribution
from the piston to the pad. Brake squeal is affected by pressure distribution, especially at low
pedal pressures.

• Inspect pistons to see if there are any that may not be returning completely.
• Exercising the caliper pistons can restore the movement of the piston to normal operation (the
brake fluid must also be clean).

Exercising Brake Caliper Pistons

• Remove brake caliper

• Remove pads and hardware

• Have the following parts on hand:

- Caliper paste 000.043.117.00

- Optimoly paste 000.043.020.00 (the 100g tube should last through several repairs)

- New hardware kit

- New dust seals

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1801

Advanced Technical Information

Information
(cont’d):

• Clean brake caliper so that there are no contaminants present when the dust seals are removed

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• Remove dust seals from the caliper pistons

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Advanced Technical Information

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Information
(cont’d):

• Extend the pistons against a block of wood to keep them from coming out of the caliper. (It may
be necessary to retract and extend the pistons several times to free up the movement)

• Apply brake caliper paste to the piston and install new dust seals on the pistons

• Retract the pistons and seat the dust seals

• Install pads and new hardware

• Install caliper on vehicle

• Flush brake fluid
• Test-drive the vehicle

In cases where additional help is needed, please file a TLAR.

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Advanced Technical Information

Warranty
Information:
Warranty Coding Information

NOTE: Documentation requirements include:
• FFT plots with the frequency and dB level highlighted as in the examples given
• Clear photographs illustrating fluid condition, contact points, wear, defects or abnormalities
properly labeled according to their location
• Part number data from pads and rotors must be photographed as in the examples shown

Labor Operations

Both labor operations below are unique labor operations that the dealer creates. They do not already
exist in the system.
(Noise is Normal)

Test Drive & Verification 47010299
35TU
Includes:
Test drive, FFT capture, and documentation (20 minutes)

Labor Operations (Noise is NOT Normal)

Test Drive & Verification 47010399
100TU
Includes:
Test drive, FFT capture, and documentation (20 minutes)

Visual inspection time with photos (10 minutes per wheel)
The following operations are claimed separately:
• Remove and Reinstall wheels
• Remove and Reinstall Front Brake Pads*
• Remove and Reinstall Rear Brake Pads*

*Includes:
Remove and Reinstall Brake Caliper (Note: New caliper bolts must be installed)

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Advanced Technical Information
Warranty
Information
(cont’d):
PQIS Coding Information

Part IDs
Calipers – Front – 4739

Rear - 4741
Rotors – Front – 4650 (4651 PCCB)

Rear - 4653 (4654 PCCB)

Pads – Front – 4636 (4634 PCCB)
Rear - 4638 (4635 PCCB)

Damage Codes (most common)
3013 Damaged – Damage to brake components

3031 Flaked off – PCCB material separation

1041 Foreign Object – Small rocks or other debris get into rotor/pad interface

1319 Lateral Runout – Lateral runout causing vibration

1417 Overheated, too hot – Rotors with bluing, pads with cracks

1316 Rubs – Backing plate rubs rotor or another object rubs against brake component

2019 Squeaks – Glazed pads/rotors, normal squeal

3311 Surface Corrosion – Corrosion on rotor surface causing noise/vibration

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended
Porsche service training courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could
assist in the proper servicing of a vehicle. Porsche special tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and
procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and may endanger the people working on it.
Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins
are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy,
the work procedures in the PIWIS Tester are the ones that must be followed.

©2018 Porsche Cars North America, Inc.

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