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1 • Front brakes - XK120 to April 1952 XK120 with manual adjusting brakes: OTS to 660979 (RHD) and 672048 (LHD), FHC to 669002 (RHD) and 679621 (LHD)
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2 • Rear brakes - XK120 to April 1952 XK120 with manual adjusting brakes: OTS to 660979 (RHD) and 672048 (LHD), FHC to 669002 (RHD) and 679621 (LHD)
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3 • Front brakes - XK120 from April 1952 and all XK140 XK120 with self adjusting brakes: OTS from 660980 (RHD) and 672049 (LHD), FHC from 669003 (RHD) and 679622 (LHD), all DHC models and all XK140
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4 • Rear brakes - XK120 from April 1952 and all XK140 XK120 with self adjusting brakes: OTS from 660980 (RHD) and 672049 (LHD), FHC from 669003 (RHD) and 679622 (LHD), all DHC models and all XK140
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5 • Front brakes - XK150
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6 • Rear brakes - XK150
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7 • Handbrake - XK120 and XK140, XK150 to May 1960 XK150: OTS to 820070 (RHD) and 832119 (LHD), DHC to 827539 (RHD) and 838753 (LHD), FHC to 825178 (RHD) and 836743 (LHD)
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8 • Handbrake - XK150 from May 1960 OTS from 820071 (RHD) and 832120 (LHD), DHC from 827540 (RHD) and 838754 (LHD), FHC from 825179 (RHD) and 836744 (LHD)
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9 • Brake hydraulics - XK120 and XK140 with single line system XK120 to April 1952: OTS to 660979 (RHD) and 672048 (LHD), FHC to 669002 (RHD) and 679621 (LHD) plus all XK140
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10 • Brake hydraulics - XK120 with dual line system XK120 from April 1952: OTS from 660980 (RHD) and 672049 (LHD), FHC from 669003 (RHD) and 679622 (LHD) plus all DHC models
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11 • Brake hydraulics - XK150
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12 • Brake servo - XK150