AUTO PARTS

Page 18 - Catalog spare parts BPW EL-TS2

Auto Parts / Page 18 BPW-EL-TS2/TSB 31231902e
3 BPW ECO Disc brake parts

3.2 Functional principle (TS2)

BPW ECO Disc brake discs TS2 3709 / 4309
FUNCTIONAL PRINCIPLE: SLIDING CALIPER BRAKE (TS2)

APPLYING THE BRAKE
During braking, the push rod of the spring brake or diaphragm cylinder presses onto the brake lever (1). The of set
position of the brake lever ampliﬁ es the force of the brake cylinder and allows it to be transferred to the traverse
(3) with low losses via a needle bearing (2).
The clamping force acts on the inner brake lining (5a) via the traverse (3) and the threaded sleeve (4).
Once the clearance between the inner brake lining and the brake disc (6) has been overcome, the reaction force is
transferred to the outer brake lining (5b) via the brake caliper.
The braking moment for the wheel results from the contact pressure of the brake linings on the brake disc.
The radial stabilizer force created by the responding brake lining at this time is transferred directly to the axle via
the brake calliper.

RELEASING THE BRAKE
When brake pressure decreases, the pressure spring (7) moves the actuating unit back to its initial position.

ADJUSTMENT
The brake is ﬁ tted with an automatic non-wearing adjusting device to maintain constant clearance between the
brake linings and the brake disc.
Each brake application also simultaneously actuates the adjustment hub (9), which is coupled with the brake
actuating unit via a shift sleeve (10), via an adjustment pin (8) in the brake lever. A reset shaft (11) with toothed
washer (12) connected to the shift sleeve deﬁ nes the clearance of the disc brake via the tooth pitch.
When the clearance increases due to brake lining and brake disc wear, the threaded sleeve (4) is turned by the
degree of wear through adjustment via a wrap spring (13).
When the clearance is correctly set, the wrap spring slides through without turning the threaded sleeve.
The overall clearance (total clearance on both sides of the brake disc) measures 0.7 − 1.3 mm.

RESET
The disc brake features a reset mechanism at the back for replacing the brake linings and brake disc.
To reset the threaded sleeve (4) to its initial position, the reset shaft equipped with a hexagon connection (14) is
moved back using a slight torque, or the clearance of the brake is preset.

BRAKE CYLINDER
Air pressure builds up behind the diaphragm due to the action of compressed air on the brake cylinder.
Air pressure forces the thrust rod out of the cylinder via the diaphragm plate.
The brakes may only be ﬁ tted with brake cylinders which are ﬁ tted with a so-called “inner sealing”, apart from the
sealing of the ﬂ ange surface.
This means that the push rod acting on the lever (1) must be hermetically sealed from the secondary chamber of
the brake cylinder, as otherwise the clamping mechanism is completely open to its surroundings.

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