PTEN_0821 - 35
* OTC BRAKE PAD
THICKNESS GAUGE
* PRO-CUT PFM 9.2 DRO
ON-CAR BRAKE LATHE
* PERMATEX SILICONE
CERAMIC EXTREME BRAKE
PARTS LUBRICANT
* CRC DISC BRAKE QUIET
AEROSOL SPRAY
* THEXTON BRAKE LINE
BLOCKERS
* SUNEX 9710M FLARE NUT
CROWFOOT SOCKET SET
* MITYVAC MV6840 HANDPUMPED
PRESSURE BLEEDER
* THEXTON MASTER CYLINDER
BENCH BLEEDING KIT
tant activates the brake pedal. Look for
a piston that might be traveling too far
before it contacts the inboard brake pad
and the rotor. This is a common problem
on rear calipers with an integral
parking brake.
Check for excessive movement in the
brake pedal before the pushrod contacts
the master cylinder. I recently serviced
a vehicle that was missing the nose that
screws into the end of the master cylinder
pushrod. This caused over two inches
of excessive movement at the pedal.
USE BLOCKERS TO
DIAGNOSE A PRESSURE LOSS
If your preliminary inspection shows
no external leaks or mechanical failures,
you're most likely facing an internal pressure
loss in a component. The best way to
diagnose this issue is by using blockers to
isolate hydraulic components (Figure 2).
Start by removing both outlet lines
at the master cylinder and replacing
them with blockers. You must use a set
of good-quality blockers. The smallest
leak at a blocker will cause an erroneous
result that could lead to the replacement
of the wrong parts. I've been using a set
of Thexton blockers for years. They
stand up well to the brake fluid without
In the
market?
Choose the TPMS tool that
works with virtually every sensor.
Get the ability to perform TPMS service with virtually any OE
or aftermarket TPMS sensor along with best-in-class vehicle
coverage. Don't settle for a TPMS tool that locks you into one
brand of aftermarket sensor. Choose the enhanced features
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corrosion, and they seal perfectly. The
brake pedal should be rock hard with
both master cylinder ports blocked. If
the pedal moves, the master cylinder
is either losing pressure internally or is
harboring trapped air.
If the master cylinder passes, block off
the outlet ports at the hydraulic control
unit (HCU). The pedal should be hard
with the ports blocked. If an outlet valve
is stuck open, you'll know it by how far
the pedal travels. A hard pedal during
this step means that the master cylinder
and the HCU are not the cause of the
low brake pedal, which means that the
problem is at one of the wheels.
Remove one blocker at a time, reinstalling
the line on the HCU. Whichever
Autodiagnos TPMS SE Tool
Full-featured TPMS service.
Autodiagnos TPMS D Tool
Diagnostics, TPMS service and
tire service in one unit.
Learn more: www.AutodiagnosTPMS.com
Circle 48 on card, or click " PTEN e-inquiry " on VehicleServicePros.com
www.VehicleServicePros.com AUGUST 2021 PROFESSIONAL TOOL & EQUIPMENT NEWS 35
2108PTEN_Continental.indd 1
7/21/21 11:13 AM
Autodiagnos TPMS - A Trademark of the Continental Corporation
http://www.AutodiagnosTPMS.com
http://www.VehicleServicePros.com
http://www.VehicleServicePros.com
PTEN_0821
Table of Contents for the Digital Edition of PTEN_0821
Editor's Note
New Products
Diagnostic Tech
2021 Innovation Awards
Tool Briefing
Tool Reviews
Category Spotlight
Big-Time Boxes
PTEN_0821 - 1
PTEN_0821 - 2
PTEN_0821 - 3
PTEN_0821 - 4
PTEN_0821 - 5
PTEN_0821 - 6
PTEN_0821 - 7
PTEN_0821 - Editor's Note
PTEN_0821 - 9
PTEN_0821 - New Products
PTEN_0821 - RSC1
PTEN_0821 - RSC2
PTEN_0821 - 11
PTEN_0821 - 12
PTEN_0821 - 13
PTEN_0821 - 14
PTEN_0821 - 15
PTEN_0821 - Diagnostic Tech
PTEN_0821 - 17
PTEN_0821 - 18
PTEN_0821 - 19
PTEN_0821 - 2021 Innovation Awards
PTEN_0821 - 21
PTEN_0821 - 22
PTEN_0821 - 23
PTEN_0821 - 24
PTEN_0821 - 25
PTEN_0821 - 26
PTEN_0821 - 27
PTEN_0821 - 28
PTEN_0821 - 29
PTEN_0821 - 30
PTEN_0821 - 31
PTEN_0821 - 32
PTEN_0821 - 33
PTEN_0821 - Tool Briefing
PTEN_0821 - 35
PTEN_0821 - 36
PTEN_0821 - 37
PTEN_0821 - 38
PTEN_0821 - 39
PTEN_0821 - 40
PTEN_0821 - 41
PTEN_0821 - 42
PTEN_0821 - 43
PTEN_0821 - 44
PTEN_0821 - 45
PTEN_0821 - 46
PTEN_0821 - 47
PTEN_0821 - Tool Reviews
PTEN_0821 - 49
PTEN_0821 - 50
PTEN_0821 - 51
PTEN_0821 - Category Spotlight
PTEN_0821 - 53
PTEN_0821 - 54
PTEN_0821 - 55
PTEN_0821 - 56
PTEN_0821 - 57
PTEN_0821 - Big-Time Boxes
PTEN_0821 - 59
PTEN_0821 - 60
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