BENDIX M-21-M-22 ANTILOCK MOD ASSY Installationsanleitung PDF herunterladen (Seite 26)

MBS-2 Installation

Plumbing Instructions

Install the MBS-2 as follows:

1. Select a suitable mounting location near the front of the bogie.

2. Install the MBS-2 in the blue service line (see Figure 16).

3. Connect the port marked “SUP” to the glad-hand side.

4. Connect the port marked “DEL” to the relay valve side.

NOTE: Because of volume considerations discussed later, the spring

brake valve may be supplied from either the “upstream” (glad-hand side)

or the “downstream” (relay side) of the MBS-2. Wabash recommends that

it be supplied from the downstream side to help purge contaminates

from the anti-compounding supply line.

IMPORTANT: When the Trailer Emergency Valve (TEV) is supplied

downstream of the MBS-2, the line from the MBS-2 must be routed

to the relay valve first, and from there, to the trailer emergency valve

(TEV). Circumstances where the TEV is supplied downstream of the

MBS-2 then 1/4" airline must be used from the R-12 to the TEV.

Wabash requires the following pneumatic plumbing:

1. From “DEL” of MBS-2, route 3/8" tubing to a tee at the relay valve.

2. From the tee at the top of the relay valve, route 1/4" tubing to the spring

brake valve anti-compounding port.

IMPORTANT: The line lengths are significant. The combined

volume in the two lines mentioned in steps 1 and 2 above must

equal the volume of between three and five feet of 3/8" tubing. The

volume of 1/4" tubing is about 40% that of 3/8" tubing of equal length.

Calculate tubing equivalents using the following formula:

Leq = equivalent length of the combined 3/8" and 1/4" tubes

L3/8 = actual length of 3/8" tubing

L1/4 = actual length of 1/4" tubing

Then:

Leq = L3/8 + (0.4 x L1/4)

The air volume in the tubing after the MBS-2 is a significant performance

factor. Leq must be between three and five feet.

Example:

3 feet of 3/8"

2.5 feet of 1/4"

Leq= 3 + 0.4 (2.5)= 4.0

281UX036

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Installationsanleitung Seite 26